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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main()
  5. {
  6.     ios_base::sync_with_stdio(false);
  7.     cin.tie(0);
  8.  
  9.     int k, n, w;
  10.     cin >> k >> n >> w;
  11.  
  12.     int total = 0;
  13.  
  14.     for (int i = 1; i <= w; i++)
  15.     {
  16.         total += (k * i);
  17.     }
  18.  
  19.     int ans = n - total;
  20.  
  21.     if (ans < 0)
  22.         cout << abs(ans);
  23.     else
  24.         cout << 0;
  25. }
Success #stdin #stdout 0.01s 5284KB
comments (?)
stdin
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3 17 4
stdout
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13
https://ideone.com/ygL38I
language:
C++14 (gcc 8.3)
created:
23 hours ago
visibility:
public

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