def solve(n, p):
    q = 1 - p
    a = [0] * (n + 1)
    for i in range(2, n//2 + 1):
        for j in range(2 * i, n + 1, i):
            a[j] += 1
    ans = 0
    for ai in a[2:]:
        ans += q ** ai
    return ans


if __name__ == '__main__':
    n, p = input().split()
    n = int(n)
    p = float(p)
    print(solve(n, p))