Out To Dinner!

Three guys go out for a meal...

After the meal, they are given the bill which totals $30. The waiter takes $10 of each of them and heads for the counter.

Upon reviewing the bill, the waiter realizes that he has over charged them for the meal by $5.

The waiter returns and as that $5 will not equally split into 3 guys, he gives them each $1 and keeps $2 for himself...

This means that each gentleman only paid $9 for the meal, totaling $27, plus the $2 the waiter keeps is only $29...

Where did the extra $1 go?