S = input()
N = len(S)
K = int(input())

nCr = {}
def cmb(n, r):
    if r == 0 or r == n: return 1
    if r == 1: return n
    if (n,r) in nCr: return nCr[(n,r)]
    nCr[(n,r)] = cmb(n-1,r) + cmb(n-1,r-1)
    return nCr[(n,r)]

def rec(i, k, isSmaller):
    if i == N:
        if k == 0:
            return 1
        else:
            return 0
    
    if k == 0:
        return 1
    
    if isSmaller:
        return cmb(N-i, k) * pow(9, k)
    else:
        if S[i] == '0':
            return rec(i+1, k, False)
        else:
            zero = rec(i+1, k, True)
            between = rec(i+1, k-1, True) * (int(S[i]) - 1)
            same = rec(i+1, k-1, False)
            return zero + between + same

print(rec(0, K, False))
