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

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

//Arguments to main() made available to every MPI process
  MPI_Init(&argc, &argv);

//Find out the current process's rank
  MPI_Comm_rank(MPI_COMM_WORLD, &rank);

//Find out the total number of processes in the communicator
  MPI_Comm_size(MPI_COMM_WORLD, &size);

//Everyone prints out who they are
  printf("Hello, world! I am %d of %d\n", rank, size);

//Clean up
  MPI_Finalize();

  return 0;
}