text: #include <omp.h>
  
  #define THREADS 2
  
  int main(void)
  {
      #pragma omp parallel num_threads(THREADS)
      {
          // pass
      }
  
      #pragma omp parallel num_threads(THREADS*4)
      {
          // pass
      }
  
      #pragma omp parallel num_threads(THREADS*2)
      {
          // pass
      }
  }