View Code of Problem 30

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

	}
	
	return 0;
}