model obstacle.mod;

if $presolve == '0' then {
	fix{i in {0,M+1}, j in X} v[i,j];
	fix{i in Y, j in {0,N+1}} v[i,j];
	}
solve;

display max{i in 1.._nccons} 
   abs(_ccon[i]), min{i in 1.._ncons} _con[i].slack;