View Code of Problem 30

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

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