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

int main(int argc, char *argv[]) { 
   int rank;

   MPI_Init(&argc, &argv); 
   MPI_Comm_rank(MPI_COMM_WORLD,&rank);

   printf("Hello World. I am process %d\n",rank);
  
   MPI_Finalize(); 
   return 0; 
}