# 数kが残る
N,P = input().split()
N = int(N)
P = float(P)

ls = [1]*(N+1)

ans = 0
for i in range(2,N+1):
    ans += ls[i]
    x = ls[i]
    k = 2
    while i * k <= N:
        ls[i*k] *= (1-P)
        k += 1

print(ans)