546A - Soldier and Bananas Codeforces || Codeforces 546A - Soldier and Bananas Solution

Problem Name: Soldier and Bananas

Problem Code: 546A

Judge: Codeforces

Problem link: Soldier and Bananas

Solution on GitHub: Soldier and Bananas

#include <iostream>

using namespace std;

int main()
{
    int k, n, w, sum = 0;
    cin >> k >> n >> w;
    for (int i = 1; i <= w; i++)
    {
        sum = sum + (k * i);
    }
    int borrow = sum - n;
    if (borrow > 0) cout << borrow << endl;
    else cout << "0" << endl;
 
    return 0;
}