N, K = map(int, input().split())
A = [int(s) + 1 for s in str(N)]
K -= 1
NA = len(A)
tot = 1
for a in A:
    tot *= a
i = 0
ans = 0
A = A[::-1]
for i in range(NA):
    ans += K % A[i] * 10 ** i
    K //= A[i]
print(ans)