Kurt reaches nirvana when he finds the product of all the digits of some positive integer. Greater value of the product makes the nirvana deeper.

Help Kurt find the maximum possible product of digits among all integers from 1 to n.

Input

The only input line contains the integer n (1 ≤ n ≤ 2⋅10^9).

Output

Print the maximum product of digits among all integers from 1 to n.

Examples

Input


390


Output


216


Input


7


Output


7


Input


1000000000


Output


387420489

Note

In the first example the maximum product is achieved for 389 (the product of digits is 3⋅8⋅9=216).

In the second example the maximum product is achieved for 7 (the product of digits is 7).

In the third example the maximum product is achieved for 999999999 (the product of digits is 9^9=387420489).
"""tri=[False]
def knight(x0,y0,moves,a):
	global n,tri
	m=[x0,y0]
	#elif moves==0:
	elif m==a:
		tri[0]=True
	x1=x0+1
	y1=y0+1

	if x1<=n and moves>0 and not([x1,y0] in y):
		knight(x1,y0,moves-1,a)
	if y1<=n and moves>0 and not([x0,y1] in y):
		knight(x0,y1,moves-1,a)

y=[]	#list of obstacles
n=int(input())	#n*n
k=int(input())	#no of moves
o=int(input())	#obstacles
for i in range(o):
	y+=[list(map(int,input().split(" ")))]

p=int(input())	#no of values to check
for i in range(p):
	x=[]
	tri[0]=False
	c=list(map(int,input().split(" ")))
	knight(1,1,k,c)
	print(tri[0])

	"""
"""
no=input()
towords(no[:])


def assist1(no):
	no=int(no)

	if no==1:
		to_add='one'
	elif no==2:
		to_add='two'
	elif no==3:
		to_add='three'
	elif no==4:
		to_add='four'
	elif no==5:
		to_add='five'
	elif no==6:
		to_add='six'
	elif no==7:
		to_add='seven'
	elif no==8:
		to_add='eight'
	elif no==9:
		to_add='nine'
	else:
		to_add=''

def assist2(no):
	below_hundred=int(no)

	
	if below_hundred==10:
		to_add='ten'
	elif below_hundred==20:
		to_add='twenty'
	elif below_hundred==30:
		to_add='thirty'
	elif below_hundred==40:
		to_add='forty'
	elif below_hundred==50:
		to_add='fifty'
	elif below_hundred==60:
		to_add='sixty'
	elif below_hundred==70:
		to_add='seventy'
	elif below_hundred==80:
		to_add='eighty'
	elif below_hundred==90:
		to_add='ninety'
	elif below_hundred==11:
		to_add='eleven'
	elif below_hundred==12:
		to_add='twelve'
	elif below_hundred==13:
		to_add='thirteen'
	elif below_hundred==14:
		to_add='fourteen'
	elif below_hundred==15:
		to_add='felifteen'
	elif below_hundred==16:
		to_add='sixteen'
	elif below_hundred==17:
		to_add='seventeen'
	elif below_hundred==18:
		to_add='eightteen'
	elif below_hundred==19:
		to_add='nineteen'
	else:
		to_add=''

def towords(no):

	if 10<below_hundred<20 or below_hundred%10==0:
		assist1(no[:-2])
	
	else:
		=assist(no[-1])

	if int(no)>100:
"""

#str_num=[]
#n=int(input())
#arr=input()
#for i in arr:
#	str_num.append(int(i))
"""
def find_sub(stri):
	maxi=0
	if stri[0]=='S':
		stri=stri[stri.find('G'):]

	while True:
		if stri.find('G')==-1 :
			break

		elif stri.find('S')==-1 :
			if len(stri)>maxi:
				maxi=len(stri)
			break

		end_index=stri.find('S')
		stri=stri[end_index:]

		if end_index > maxi:
			maxi=end_index

		var=stri.find('G')
		if var!=-1:
			stri=stri[var:]

	return maxi

			

		

def main():
	n=int(input())
	trophies=input()

	if trophies.find('S')==-1:
		return n
	if trophies.find('G')==-1:
		return 0


	maxy=0
	for i in range(n):
		for j in range(i+1,n):
			if trophies[i]!=trophies[j]:			
				temp=find_sub(trophies[:i]+trophies[j]+trophies[i+1:j]+trophies[i]+trophies[j+1:])
				if temp> maxy:
					maxy=temp

	return maxy

#print(main())

for i in range(100000):
	print("a", end="")"""

"""
def hhh():
	n,m=map(int,input().split())
	done=[]
	count=0

	A=list(map(int,input().split(" ")))
	B=list(map(int,input().split(" ")))

	for i in range(m):
		done.append(A[0]+B[i])
		print(0,i)


	while True:
		for i in range(n):
			for j in range(m):
				if(A[i]+B[j] not in done):
					print(i,j)
					done.append(A[i]+B[j])
					count+=1
					if count==m+n-1:
						print(done)
						return

hhh()


def Tee(N,M):
	if M - N>0:
		temp=str(M - N)
	else:
		temp=str(N - M)
#	print(temp)
	if (int(temp)/2)%2!=0:
		print("Even")
	else:
		print("Odd")

	
for i in range(int(input())):
	N,M=map(str,input().split(" "))
	if int(N[-1])%2==0:
		N1=int(N[-1])+1
#		print(N,N[-1],N1)
	else:
		N1=int(N[-1])
#		print(N,N[-1],N1)	
	if int(M[-1])%2==0:
		M1=int(M[-1])-1
#		print(M,M[-1],M1)
	else:
		M1=int(M[-1])
	Tee(N1,M1)"""
"""	
from copy import deepcopy
def rec(current,final,time):
	if memoization[current[0]][current[1]]!=-1 and memoization[current[0]][current[1]]+matrix[current[0]][current[1]]>memoization[][]

matrix=[]
memoization=[]
R,C=map(int,input().split())


temp=[-1 for i in range(C)]

for i in range(R):
	matrix.append(list(map(int,input().split())))
	memoization.append[temp[:]]

D=int(input())
current=[0,0]
for i in range(D):
	x=int(input())
	y=int(input())
	rec(current,[x-1,y-1])


N,K,w=map(int,input().split())

Arr=list(map(int,input().split()))
finalScore=0
for i in range(K):
	
	sumAll=0
	startAll=0
	endAll=0
	start=0
	sumI=0

	for j in range(N):
		if(j<w):
			start=0
			sumI+=Arr[j]
		else:
			start=j-w+1
			sumI+=(Arr[j]-Arr[j-w])

		if(sumI>sumAll):
			sumAll=sumI
			startAll=start
			endAll=j

	for j in range(N-w,N):
		sumI-=Arr[j]
		start=j+1

		if(sumI>sumAll):
			sumAll=sumI
			startAll=start
			endAll=N-1
	print(startAll,endAll)
	for q in range(startAll,endAll+1):
		Arr[q]=0
	print(Arr)
	finalScore+=sumAll

print(finalScore)
class div(object):

	def __init__(self,no5,no2):
		self.no2 = no2
		self.no5 = no5

	def __add__(self,toadd):
		return(div(self.no5+toadd.no5,self.no2+toadd.no2))
	
a=[]
ans=[[]]
path=[[]]

def rec(divObj,i,j,N,pathi):
	zeros=min(divObj.no5,divObj.no2)

	if ans[i][j]!=-1 and zeros<ans[i][j]:
		ans[i][j]=zeros
		path[i][j]=pathi
	elif ans[i][j]==-1:
		ans[i][j]=zeros
		path[i][j]=pathi
	else:
		return

	if j+1<N:
		rec(divObj+a[i][j+1],i,j+1,N,pathi+"R")

	if i+1<N:
		rec(divObj+a[i+1][j],i+1,j,N,pathi+"D")

N=int(input())

for i in range(N):
	a.append(list(map(int,input().split())))

for i in range(N):
	for j in range(N):
		temp=a[i][j]

		a[i][j]=div(0,0)

		br1=temp

		while True:
			br1=br1/5
			if br1%1==0:
				a[i][j].no5+=1
			else:
				break

		br2=temp

		while True:
			br2=br2/2
			if br2%1==0:
				a[i][j].no2+=1
			else:
				break

ans = [[-1 for i in range(N)] for j in range(N)]
path = [["" for i in range(N)] for j in range(N)]

rec(a[0][0],0,0,N,"")

print(ans[N-1][N-1])
print(path[N-1][N-1])"""


n=int(input())

n=list(map(int,list(str(n))))
nn=n[:]

for i in range(len(n)-1,0,-1):
	if(n[i]==9):
		continue
	elif(n[i]==0):
		n[i]=9
		n[i-1]-=1
		for j in range(i-1,0,-1):
			if(n[j]<0):
				n[j]=9
				n[j-1]-=1
			else:
				break				
	elif(n[i]*n[i-1]<9*(n[i-1]-1)):
		n[i-1]-=1
		for j in range(i,-1,-1):
			if(n[j]<0):
				n[j]=9
				n[j-1]-=1
		n[i]=9

mul=1
for i in n:
	if(i!=0):
		mul*=i

n=[9 for i in range(len(nn))]

n[0]=nn[0]-1

for i in range(1,len(nn)):
#	print(n)
	mul1=1
	for j in n:
		if(j!=0):
			mul1*=j
	if(mul1>mul):
		mul=mul1

	n[i-1]+=1
	n[i]=nn[i]-1


print(mul)