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

int main(int argc, char **argv) {
  int rank, size, err, n;

  MPI_Init(&argc, &argv);

  MPI_Comm_size(MPI_COMM_WORLD, &size);
  MPI_Comm_rank(MPI_COMM_WORLD, &rank);

  printf("rank=%d size=%d\n", rank, size);

  MPI_Finalize();

  return 0;
}