View Code of Problem 30

#include<stdio.h>
int main(){
	int n,i;
	
	int sum;
	while(scanf("%d",&n)!=EOF){
	 sum=0;

	for(i=1;i<=n;i++){
		
	sum=sum+i;
	
	}printf("%d\n",sum);
	
	}
	
		
}