#include "mpi.h"
#include <stdio.h>
int main( int argc, char **argv ){
 int rank, size;
 MPI_Init( &argc, &argv );
 MPI_Comm_rank( MPI_COMM_WORLD, &rank );
 MPI_Comm_size( MPI_COMM_WORLD, &size );
 printf( "Hello world! I'm process %d of %d\n",rank, size );
 MPI_Finalize();
 return 0;
}