View Code of Problem 30

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