View Code of Problem 30

#include <stdio.h>
#include <math.h> 

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


	return 0;
}