If you have a penny, a nickel, and a dime, you have 16 cents.
If you have a penny, a nickel, and a quarter, you have 31 cents.
If you have a penny, a dime, and a quarter, you have 36 cents.
If you have a nickel, a dime, and a quarter, you have 40 cents.

So you see, it all depends on what the 3 different denominations
are.  If you allow having 50 cent or dollar coins, you'd have a lot
more.

Edwin