View Code of Problem 30

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

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