#include <stdio.h>
#include <mpi.h>
int main(int argc, char **argv)
{
  int my_rank, numprocs;
  MPI_Init(&argc,&argv);
  MPI_Comm_size(MPI_COMM_WORLD,&numprocs);
  MPI_Comm_rank(MPI_COMM_WORLD,&id);
  /*printf("Hello! It is processor %d.\n", id);*/
   if (my_rank == 0)
   {
    printf("Hello! It is processor 0. There are %d processors in this comm. world.\n", numprocs);
    printf ("I am process %i out of %i: Hello world!\n",my_rank, size);
   }
   else
   {
     printf("I am process %i out of %i: Hello world!\n", my_rank, size);
   }
  MPI_Finalize();
  return 0;
}