View Code of Problem 30

#include<stdio.h>
#include <math.h>
#include <string.h>
#include <ctype.h>
#include <math.h>
#define Max 100
int main()
{
	int n,i,sum;
	while(scanf("%d",&n)!=EOF)
	{
		sum=0;
		for(i=1;i<=n;i++)
		{
			sum+=i;
		}
		printf("%d\n",sum);
	}
	return 0;
}