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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int dp[100000];
  5.  
  6. int main() {
  7.  
  8. int n;
  9.  
  10. cin >> n;
  11.  
  12. dp[0] = n;
  13.  
  14. for (int i = 1; i < 100000; i++) {
  15. dp[i] = i + dp[i - 1];
  16. }
  17.  
  18. cout << dp[100000 - 1] << endl;
  19.  
  20. return 0;
  21. }
Success #stdin #stdout 0s 3804KB
stdin
10
stdout
704982714