#include <bits/stdc++.h>
using namespace std;

int main() {
    for (int i = 1;; i++) {
        int flag = 0;
        int x = i;
        for (int j = 1; j <= 5; j++) {
            if ((x - 1 <= 0) || (x - 1) % 5 > 0) {
                flag = 1;
                break;
            }
            x = (x - 1) / 5 * (5 - 1);
        }
        if (flag == 0) {
            cout << i << endl;
            exit(0);
        }
    }

    return 0;
}