View Code of Problem 30

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

}