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

int main() {
    int vitri = 40, loinhuan = 0;
    int s10 = 20, s5 = 17, s2 = 15;
    loinhuan = loinhuan + 10 * min(s10, vitri);
    vitri = vitri - min(s10, vitri);
    loinhuan = loinhuan + 5 * min(s5, vitri);
    vitri = vitri - min(s5, vitri);
    loinhuan = loinhuan + 2 * min(s2, vitri);
    cout << "GTLN cua gia hang: " << loinhuan;
}