import os
def main():
    n, p = input().split()
    n = int(n)
    p = float(p)
    dp = [1. for _ in range(n+1)]
    for i in range(2, len(dp)):
        for j in range(2,int(len(dp)/i)):
            dp[i*j] *= 1-p
    dp = dp[2:]
    print(sum(dp))
        
if os.getenv("DEBUG"):
    from pathlib import Path
    f = open(str(Path(__file__).parent / "input.txt"))
    input = f.readline
    while True:
        main()
else:
    main()