View Code of Problem 30

#include "stdio.h"
#include "math.h"
#include "string.h"

void main()
{
	int i,j,k;
	int n;
	for(;scanf("%d",&n)!=EOF;)
	{
		int sum=0;
		for(i=0;i<=n;i++)
			sum=sum+i;
		printf("%d\n",sum);
	}
	
}