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

int main(int argc, char **argv)
{
  int NoProc, ID, Num;
  MPI_Status Status;

  MPI_Init(&argc,&argv);

  MPI_Comm_size(MPI_COMM_WORLD,&NoProc);
  MPI_Comm_rank(MPI_COMM_WORLD,&ID);

  Num = ID;
  if(ID == 0)
        {
            MPI_Send(&Num, 1, MPI_INT, 1, 0, MPI_COMM_WORLD);
            MPI_Recv(&Num, 1, MPI_INT, 19, MPI_ANY_TAG, MPI_COMM_WORLD, &Status);
            printf("I am %d/%d And the total is = %d\n", ID, NoProc, Num);
        }

  if((ID >= 1)&& (ID < (NoProc - 1)))
        {
            MPI_Recv(&Num, 1, MPI_INT, (ID - 1), MPI_ANY_TAG, MPI_COMM_WORLD, &Status);
            Num = Num + ID;
            printf("I am %d/%d And the total is = %d\n", ID, NoProc, Num);
            MPI_Send(&Num, 1, MPI_INT, (ID + 1), 0, MPI_COMM_WORLD);
        }

  if(ID == (NoProc - 1))
        {
            MPI_Recv(&Num, 1, MPI_INT, (ID - 1), MPI_ANY_TAG, MPI_COMM_WORLD, &Status);
            Num = Num + ID;
            MPI_Send(&Num, 1, MPI_INT, 0, 0, MPI_COMM_WORLD);
        }

  MPI_Finalize();
}