thevinhckweekend

include <bits/stdc++.h>

using namespace std; int main() { long long n, digit, count = 0, n2 = 1; cin >> n >> digit; for (int i = 2; i <= n; i++) { n2 = n2 * i; } n = n2; while (n2 > 0) { n2 /= 10; count += 1; } digit = count - digit; cout << (long long)(n / pow((double)10, (double)digit)); }