#include "mpi.h"
#include <stdio.h>
   
int main(void) 
{
 int rankID;
 int sizeNum;
 MPI_Init(0, 0);
 MPI_Comm_size(MPI_COMM_WORLD, &sizeNum);
 MPI_Comm_rank(MPI_COMM_WORLD, &rankID);
 printf("Hello world! %d of total = %d\n", rankID, sizeNum);
 MPI_Finalize();
 return 0;
}