import sys, time, random
from collections import deque, Counter, defaultdict
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
mi = lambda: map(int, input().split())
li = lambda: list(mi())
inf = 2 ** 63 - 1
mod = 998244353
n = ii()
r = float(input())
ans = 0

for i in range(0, n):
    ans += pow(1 - r, i) * 100
print(ans)