View Code of Problem 30

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

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