#include <stdio.h>

int f1(int x);

int f2(int x)
{
  if(x==1) return 0;
  f1(x-1);
}

int f1(int x)
{
  if(x==1) return 0;
  f2(x-1);
}

int f(int x)
{
  if(x==0) return 0;
  if(x==1) return 1;  
  return f(x-1)+f(x-2);
}

int main()
{
  char *s;
  s = (char *)malloc(50);
  (void)strlcpy(s,"hello, ",50);
  (void)strlcat(s,"world",50);
  putstring(s);
  putnl();
  free(s);
  putint(f(10));
  putnl();
  putint(f1(10));
  putnl();
  return 0;
}