#include <iostream>
#include <mpi.h>
 
using namespace std;
 
int main() {
    // initialize the MPI environment
    MPI_Init(NULL, NULL);
 
    // get the number of processes
    int worldSize;
    MPI_Comm_size(MPI_COMM_WORLD, &worldSize);
 
    // get the rank of the process
    int rank;
    MPI_Comm_rank(MPI_COMM_WORLD, &rank);
 
    cout << "Hello world from process " << rank << " out of " << worldSize << endl;
 
    MPI_Finalize();
    return 0;
}
 

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