call MPI_UNPACK(d30,400,position,outbuf1,10,MPI_INTEGER,MPI_COMM_WORLD,ierr)
		 |   |      |     |      |       |             |         |
               input |   current  |   number  datatype   communicator  error
              buffer |  position  |     of  
		   size  (bytes)  | components 
		    of            |    to be
                  input           |  unpacked
                  buffer          |
		  (bytes)      output
			       buffer