for (int i = 0; i < size - 1; i++) {
MPI_Recv(&recv_buff, 1, MPI_INT, MPI_ANY_SOURCE, MPI_ANY_TAG, MPI_COMM_WORLD, &status);
printf("Message received from %d\n", recv_buff);
for (int i = 0; i < size - 1; i++) {
MPI_Recv(&recv_buff, 1, MPI_INT, MPI_ANY_SOURCE, MPI_ANY_TAG, MPI_COMM_WORLD, &status);
printf("Message received from %d\n", recv_buff);