945

//945
#include <iostream>
#include <cstdio>
using namespace std;

int main(void) {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
    int n;
    cin >> n;
    cout << n * 750 - n / 13 * 350;
    return 0;
}