def binomial_Coeff(n,k):
     
    if k > n : 
       return 0
    if k==0 or k ==n : 
        return 1 
    return binomial_Coeff(n-1,k-1) + binomial_Coeff(n-1,k) 
def is_not_prime(n):
    import math
    
    result = False
    for i in range(2,int(math.sqrt(n)) + 1):
        if n % i == 0:
            result = True
    return result