#include "stdio.h"
#include "mpi.h"

#define HOSTNAMELEN 256

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

  MPI_Init(&argc, &argv);
  MPI_Comm_rank(MPI_COMM_WORLD, &rank);
  MPI_Comm_size(MPI_COMM_WORLD, &size);
  gethostname(hostname, HOSTNAMELEN);
  printf("Hello, world! I am %d of %d from %s\n", rank, size,hostname);
  MPI_Finalize();
  return 0;
}