import sys


def input(): return sys.stdin.readline().rstrip('\n')


def main():
    n, p = input().split()
    n, p = int(n), float(p)

    ans = 0
    f = [0] * (n+1)
    for i in range(2, n+1):
        ans += (1-p) ** f[i]
        for j in range(2*i, n+1, i):
            f[j] += 1

    print(ans)


if __name__ == '__main__':
    main()