Codeforces 546A Soldier and Bananas

A. Soldier and Bananas

solution in c++

#include<bits/stdc++.h>

#include<string.h>

#include<stdio.h>

#include<math.h>

using namespace std;

int main()

{

    int i, n, t, k, w;

long long sum=0;

cin>> k>>n>>w;

for(i=1; i<=w; i++){

sum = sum+(i*k);

}

if(sum<= n){

cout <<0<<"\n";

}

       else cout << sum - n << "\n";

}

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