#エラトステネスのざる

n , p = input().split()

N = int(n)
P = float(p)

l = [0] * (N + 1)
ans = 0

for i in range(2 , N + 1):
    ans += (1 - P) ** l[i]
    for j in range(i + 1 , N // i + 1):
        if j == i:
            l[i * j] += 1
        else: 
            l[i * j] += 2
    
print(ans)