Gerald is setting the New Year table. The table has the form of a circle; its radius equals *R*. Gerald invited many guests and is concerned whether the table has enough space for plates for all those guests. Consider all plates to be round and have the same radii that equal *r*. Each plate must be completely inside the table and must touch the edge of the table. Of course, the plates must not intersect, but they can touch each other. Help Gerald determine whether the table is large enough for *n* plates.
The first line contains three integers *n*, *R* and *r* (1 ≤ *n* ≤ 100, 1 ≤ *r*, *R* ≤ 1000) — the number of plates, the radius of the table and the plates' radius.
4 10 4
YES
5 10 4
NO
1 10 10
YES
3 10 20
NO
2 20 11
NO
6 9 3
YES
1 999 1000
NO
1 1000 999
YES
2 1000 500
YES
2 1000 499
YES
10 1000 236
YES
10 1000 237
NO
6 999 334
NO
100 1000 1
YES
100 1000 50
NO
13 927 179
YES
13 145 28
NO
37 307 24
YES
37 857 67
NO
100 821 25
YES
100 197 6
NO
93 704 23
YES
93 857 28
NO
85 870 31
YES
85 449 16
NO
29 10 1
NO
3 10 5
NO
2 4 2
YES
2 10 5
YES
4 2 1
NO
3 2 1
NO
59 486 43
NO
4 997 413
NO
100 100 5
NO
2 100 50
YES
2 2 1
YES
1 100 45
YES
2 20 10
YES
36 474 38
NO
6 996 333
NO
23 100 12
NO
100 886 27
NO
7 997 332
NO
10 72 17
NO
85 449 16
NO
2 10 10
NO
import math
n, R, r=  list(map(int, input().split()))
a= r/math.sin(math.pi/n)
if (a <= (R-r)):
  print ("yes")
else:
  print ("no")