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

int main(int argc, char* argv[])
{
    int myid, numprocs, namelen;
    char processor_name[MPI_MAX_PROCESSOR_NAME];
    MPI_Init(&argc, &argv);
    MPI_Comm_rank(MPI_COMM_WORLD, &myid);
    MPI_Comm_size(MPI_COMM_WORLD, &numprocs);
    MPI_Get_processor_name(processor_name, &namelen);
    if (myid == 0) printf("number of processes: %d\n", numprocs);
    printf("%s: Hello world from process %d \n", processor_name, myid);
    MPI_Finalize();
    return 0;
}