Therefore you say I see more than (y - 2) statues while he says morethan (x + 2) until you both repeat the same value. You know you cannot lie so a simple iter

Therefore you say I see more than (y - 2) statues while he says morethan (x + 2) until you both repeat the same value. You know you cannot lie so a simple iteration on inequalities is enough to find the right value. This relies on your friend figuring out the linear addition scheme.