#include <bits/stdc++.h>

using namespace std;

long long n, a, k = 1, c;

long long fuck (long long b) {
    for (int i = 1; i <= b; i ++) {
        k *= i;
        while (k) {
            if (k % 10 == 0) k /= 10; else
                break;
        }
        k %= 100000;
    }
    return k % 1000;
}

int main()
{
    cin >> n;
    a = fuck(n);
    if (a >= 100) {cout << a; return 0;}
    if (a >= 10 && a < 100) {cout << 0 << a; return 0;}
    if (a < 10) cout << 0 << 0 << a;
}