n, p = map(str, input().split())
n = int(n)
p = float(p)

D = [0]*(n+1)
for i in range(1, n+1):
    j = i
    while i <= n:
        D[i] += 1
        i += j
#print(D)
ans = 0
for i in range(2, n+1):
    ans += (1-p)**(D[i]-2)
print(ans)