View Code of Problem 30

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