#include <stdio.h>

int a=-1;

int main(int n, int k)
{
  if(a==-1)
    {
  a++;
  main(10,20);
  return a;
    }
  if(a!=-1)a+=k;
  if(n==1)return;
  main(n-1,k);
}

/* [liveuser@localhost ~]$ gcc recurmain.c && ./a.out */
/* [liveuser@localhost ~]$ echo $? */
/* 200 */