View Code of Problem 30

#include <stdio.h>
int main()
{
	int i;
	int n = 0;
	int p;
	while(scanf("%d",&i)!=EOF)
	{ 
			n = ((1+i)*i)/2;
    	printf("%d\n",n);
    	n = 0;
 }
	return 0;
 }