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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	// your code goes here
  6. 	long long n,k,w;
  7. 	cin>>k>>n>>w;
  8. 	long long a=(w*k*(w+1))/2-n;
  9. 	cout<<a;
  10.  
  11. 	return 0;
  12. }
Success #stdin #stdout 0.01s 5392KB
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stdin
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3 17 4
stdout
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13
https://ideone.com/kKvUTe
language:
C++14 (gcc 8.3)
created:
1 year ago
visibility:
public

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