import random

kocka,prĂłbĂĄlkozĂĄs=map(int,input().split())
teljes=0
for i in range (prĂłbĂĄlkozĂĄs):
    max6=0
    for j in range (kocka):
        most=1
        while random.randint(1,6)!=6:
            most+=1
        if most > max6 :
            max6 = most
    teljes += max6
print(f"{(float(teljes))/float(prĂłbĂĄlkozĂĄs):0.1f}")