import random                                                                                       

N = 10                                                                                              
NUM_ROLLS = 1000000                                                                                 
UPPER_BOUND = 9 * N / 2                                                                             
LOWER_BOUND = 3 * N / 2                                                                             

counter = 0                                                                                         
for _ in range(NUM_ROLLS):                                                                          
  s = sum([random.randint(1, 6) for _ in range(N)])   
                                            
  if s < UPPER_BOUND and s > LOWER_BOUND:                                                           
    counter += 1                                                                                    

prob = 1.0 * counter / NUM_ROLLS                                                                    
                                                               
print(prob)