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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int k,n,w,cost;
  6. 	cin>>k>>n>>w;
  7. 	cost=0;
  8. 	for(int i = 1; i<=w; i++){
  9. 		cost+=i*k;
  10. 	}
  11. 	if(cost<=n){
  12. 		cout<<"0";
  13. 	}
  14. 	else{
  15. 		cout<<abs(n-cost);
  16. 	}
  17. 	return 0;
  18. }
Success #stdin #stdout 0.01s 5292KB
comments (?)
stdin 
3 17 4
stdout 
13
https://ideone.com/sUHI8k
language:
C++14 (gcc 8.3)
created:
7 hours ago
visibility:
public

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