N = int(input())
R = float(input())
ans = [0.0] * (N + 1)

ans[1] = 100.0
for i in range(1, N):
    # if i == N - 1:
    #     continue
    ans[i + 1] = (1 - R) * ans[i]
    # ans[i] = R * ans[i]


print(sum(ans))