View Code of Problem 30

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

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