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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	double a,i,n,t = 0;	cin >> a >> i >> n;
  6. 	t = (n/2.0)*(2.0*a + (n-1.0)*a);
  7. 	cout << fixed <<  (int)max(t-i,0.0);
  8. 	return 0;
  9. }
Success #stdin #stdout 0.01s 5284KB
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1000 0 1000
stdout
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500500000
https://ideone.com/kw7oeZ
language:
C++ (gcc 8.3)
created:
6 days ago
visibility:
public

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