#!/bin/python3

# generate random integer values
from random import seed
from random import randint
# seed random number generator
seed()
n_exp = 100000
n_fav = 0
n_dice = 10
n_times = 3
# generate some integers
for i in range(n_exp):
    n_6 = 0
    for j in range(n_dice):
        if randint(1,6) == 6:
            n_6 += 1
    #print(n_6)
    if n_6 == n_times:
        n_fav+=1

print(float(n_fav)/float(n_exp))