View Code of Problem 30

#include <stdio.h>
#include <stdlib.h>

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