func mcnugget(limit) {
    var sv = Array.Empty(limit + 1, false)
    for s in 0^6..limit {
        for n in s^9..limit {
            for t in n^20..limit {
                sv[t] = true
            }
        }
    }
    for i in limit^-1..0 {
        if !sv[i] {
            print("Maximum non-McNuggets number is \(i)")
            return
        }
    }
}

mcnugget(100)