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

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

   MPI Init(&argc, &argv);
   MPI Comm rank(MPI COMM WORLD, &rank);
   MPI Comm size(MPI COMM WORLD, &size);

   printf("Hello, world! I am %d of %d\n", rank, size);

   MPI Finalize(); 
   
   return 0;
 }