This program produces a capacitated transportation problem in .min
format, laid out on a grid-on-torus.  Contributed by A. Goldberg
     ango@Theory.Stanford.EDU 

goto.c should be compiled with the math library, e.g.
"cc -O goto.c -lm" in UNIX.

The GOTO generator expects 5 (integer) inputs. The inputs are as follows.

No. |	DESCRIPTION			| RESTRICTIONS
-----------------------------------------------------------------------------
 1  | number of nodes, N		| N >= 15
 2  | number of arcs, M			| 6*N <= M <= N^(5/3)
 3  | max. capacity, MAXCAP		| MAXCAP >= 8
 4  | max. arc cost, MAXCOST		| MAXCOST >= 8
 5  | seed (for random number generator)|
 ----------------------------------------------------------------------------