fn main() {
    let m = 3
    let n = 3
    println(ackermann(m, n))
}

fn ackermann(m int, n int) {
    if m == 0 {
        return n + 1
    } else if n == 0 {
        return ackermann(m - 1, 1)
    } else {
        return ackermann(m - 1, ackermann(m, n - 1))
    }
}