View Code of Problem 30

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