#include “mpi.h”
int main( int argc, char* argv[] )
{
 int rank;
 int nproc;
 MPI_Init( &argc, &argv );
 MPI_Comm_size( MPI_COMM_WORLD, &nproc );
 MPI_Comm_rank( MPI_COMM_WORLD, &rank );
 /* write codes for you */
 MPI_Finalize();
}