这个lingo程序运行很长时间出不来结果

这个lingo程序运行很长时间出不来结果
model:
sets:
people/1..29/;
group/1..5/;
meeting/1..7/;
links(people,group,meeting):x;
links2(people,people)|&1#lt#&2:y;
endsets
max=@sum(links2:y);
@for(people(i):@for(meeting(k):
@sum(group(l):x(i,l,k))=1));
@for(group(l):@for(meeting(k):
@sum(people(i):x(i,l,k))>=5));
@for(group(l):@for(meeting(k):
@sum(people(i):x(i,l,k))=y(i,j)));
@for(links:@bin(x));
@for(links2:@bin(y));
end