def Comb(n,k):
    if k==0 or n==k:
        c= 1
    else:
        c=Comb(n-1,k-1)+Comb(n-1,k)
    return c

def Binom(k,n,p):
    P=Comb(n,k)*pow(p,k)*pow(1-p,n-k)
    return P

def Binomcum(k,n,p):
    S=0
    for i in range(0,k+1):
        S=S+Binom(i,n,p)
    return S