View Code of Problem 30

#include<stdio.h>
int main()
{
  int n,sum;
  while(scanf("%d",&n)!=EOF)
  {
    sum=n*(1+n)/2;
    printf("%d\n",sum);
  }
  return 0;
}

#include<stdio.h>
int main()
{
  int n,sum;
  while(scanf("%d",&n)!=EOF)
  {
    sum=n*(1+n)/2;
    printf("%d\n",sum);
  }
  return 0;
}

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