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  1. #include <stdio.h>
  2. int main() {
  3.     int n;
  4.     scanf("%d", &n);
  5.     printf("Sum=%d", n*(n+1)/2);
  6.     return 0;
  7. }
  8.  
Success #stdin #stdout 0s 5320KB
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stdout
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Sum=3
https://ideone.com/xIAVhJ
language:
C (gcc 8.3)
created:
10 days ago
visibility:
public

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