Wikipedia
The McNuggets version of the coin problem was introduced by Henri Picciotto,
who included it in his algebra textbook co-authored with Anita Wah. Picciotto
thought of the application in the 1980s while dining with his son at
McDonald's, working the problem out on a napkin. A McNugget number is
the total number of McDonald's Chicken McNuggets in any number of boxes.
In the United Kingdom, the original boxes (prior to the introduction of
the Happy Meal-sized nugget boxes) were of 6, 9, and 20 nuggets.

Task

Calculate (from 0 up to a limit of 100) the largest non-McNuggets
number (a number n which cannot be expressed with 6x + 9y + 20z = n
where x, y and z are natural numbers).




 
Dim As Integer l(100), a, b, c, n
For a = 0 To 100/6
    For b =  0 To 100/9
        For c = 0 To 100/20
            n = a*6 + b*9 + c*20
            If n <= 100 Then l(n) = true
        Next c
    Next b
Next a
For n = 100 To 1 Step -1
    If l(n) = false Then Print "El mayor número que no sea McNugget es:"; n: Exit For
Next n
End
 