View Code of Problem 30

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