fn ggt(c: int, d: int) -> int {
        let mut a = c;
        let mut b = d;

        if a==0 { ret b; }
        else {
                while b != 0 {
                        if a > b {
                                a = a-b;
                        }
                        else {
                                b = b-a;
                        }
                }
        }
        ret a;
}

fn main() {
        let ergebnis = ggt(16,6);

        io::println(#fmt("%d", ergebnis));
}