#include <stdio.h>
#include <mpi.h>

int main(int argc, char **argv) {
  int rank, size;
  
  MPI_Init( &argc, &argv );
  
  MPI_Comm_size( MPI_COMM_WORLD, &size );
  MPI_Comm_rank( MPI_COMM_WORLD, &rank );
  printf( "Hello world from process %d of %d\n", rank, size );
  
  MPI_Finalize();
  
  return 0;
}