hello_mpi.c
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	#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 from process %d of %d\n", rank, size );
	MPI_Finalize();
	return 0;
	}