import numpy as np

N,p = input().split()
N = int(N); p = float(p)

dp = np.zeros(N+1, np.int32)

for i in range(2,N+1):
    dp[i:N+1:i]+=1
    
ans = 0
for i in range(2,N+1):
    ans += (1-p)**(dp[i]-1)
print(ans)