View Code of Problem 30

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