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  1. #include <bits/stdc++.h>
  2. using namespace std ;
  3. int main(){
  4. long long num ;
  5. cin>>num ;
  6. cout<< num * (num+1)/2 <<endl;
  7.  
  8. }
Success #stdin #stdout 0.01s 5352KB
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Standard input is empty
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375572338423954544
https://ideone.com/06UnZF
language:
C++14 (gcc 8.3)
created:
1 year ago
visibility:
public

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