Test Anxiety

    1#include <bits/stdc++.h>
    2using namespace std;
    3int main(){
    4    ios::sync_with_stdio(0); cin.tie(0);
    5    int cur, t; cin >> cur >> t;
    6    int need = 80 * (t + 1) - (cur * t);
    7    if(need < 0){
    8        cout << 0 << endl;
    9    } else if(need > 100){
    10        cout << -1 << endl;
    11    } else{
    12        cout << need << endl;
    13    }
    14}