N, K = map(int, input().split())

# 31415 -> [3, 1, 4, 1, 5]
N_list = list(map(int, str(N)))

ct = 1
prod = []
final_digit = len(N_list)
for digit in range(len(N_list)):
    idx = len(N_list) - digit - 1
    if ct * (N_list[idx] + 1) > K:
        final_digit = digit
        break
    ct *= N_list[idx] + 1
    prod.append(ct)

ans = 0
K -= 1
for i in range(final_digit - 1, -1, -1):
    x, K = divmod(K, prod[-1 - i])
    ans += x * 10 ** i
ans += K
print(ans)