View Code of Problem 30

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

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