import sys
import argparse


def main():
    p, q = list(map(int,input().split()))

    p = float(p)
    q = float(q)
    w = pow(p, -1)
    t = pow(p, -1)
    x = p*p
    y = (p-1)
    ans = 0
    prevans = -1000
    i = 0
    while True:
        ans = w * (x - p * y - i*y ) 
        w = w * t
        x = x * p
        y = y * (p-1)
        i = i + 1
        if ans - prevans < 1e-3:
            break
        prevans = ans
    
    print(min(ans, q))

if __name__ == "__main__":
    parser = argparse.ArgumentParser()
    parser.add_argument('--file', dest='filename', default=None)
    args = parser.parse_args()
    if args.filename is not None:
        sys.stdin = open(args.filename)
    main()