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

	int main(int argc, char *argv[]){
	int size, rank;
	MPI_Init(&argc, &argv);
	MPI_Comm_size(MPI_COMM_WORLD, &size);
	MPI_Comm_rank(MPI_COMM_WORLD, &rank);

	printf("I’m process %d out of %d\n", rank, size);
	MPI_Finalize();
	}