#include <stdio.h>
#include <stdlib.h>

int get_num_threads();
int get_thread_id();

int main() {

  int nthreads = -1;

  nthreads = get_num_threads();    
  printf("\nSerial: %d\n\n",nthreads);

  // Outer parallel region
#pragma omp parallel private(nthreads)
  {

    int idx = 0;

    nthreads = get_num_threads();    
    idx      = get_thread_id();
#pragma omp single
    printf("Outer parallel: %d\n\n",nthreads);
    
    // Inner parallel region
#pragma omp parallel num_threads(idx+1) private(nthreads)
    {
      nthreads = get_num_threads();
#pragma omp single
      printf("Inner parallel: %d\n",nthreads);
    }
#pragma omp barrier
#pragma omp single
    printf("\n");
  }


  return 0;
}

int get_num_threads() {  
  return -1;
}

int get_thread_id() {  
  return -1;
}