import sys
sys.setrecursionlimit(5*10**5)
input = sys.stdin.readline
from collections import defaultdict, deque, Counter
from heapq import heappop, heappush
from bisect import bisect_left, bisect_right
from math import gcd

n = int(input())
R = float(input())

now = 100
ans = 0
for i in range(n):
    ans += now
    now *= (1-R)

print(ans)