View Code of Problem 30

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

	   }
	   

}