SmallR is an archer. SmallR is taking a match of archer with Zanoes. They try to shoot in the target in turns, and SmallR shoots first. The probability of shooting the target each time is <img align="middle" class="tex-formula" src="https://espresso.codeforces.com/a7487d7e62f90136b78ae3fbf0a008396f146e13.png" style="max-width: 100.0%;max-height: 100.0%;"/> for SmallR while <img align="middle" class="tex-formula" src="https://espresso.codeforces.com/c443c7703e51f03d0eece0b96b9e84e425878209.png" style="max-width: 100.0%;max-height: 100.0%;"/> for Zanoes. The one who shoots in the target first should be the winner.

Output the probability that SmallR will win the match.
A single line contains four integers <img align="middle" class="tex-formula" src="https://espresso.codeforces.com/488158367221f441ba94b9475c03436069df2a7e.png" style="max-width: 100.0%;max-height: 100.0%;"/>.
import random
a,b,c,d=map(int,input().split())
"""
i=0
res1,res2=0,0
while i<1000000:
    x=random.randint(1,b)
    if x<=a:
        res1+=1
    else:
        y=random.randint(1,d)
        if y<=c:
            res2+=1
    i+=1
print(res1/(res1+res2))"""
"""x=a/b
i=0
ll=[a/b,(b-a)/b,(d-c)/d]
t=ll[1]*ll[2]
res=a/b
while i<1000000:
    res+=(x*t)
    t*=t
    i+=1"""
print((a/b)/(1-((b-a)/b)*((d-c)/d)))