fn mediantNum(a: u32, c: u32) -> u32 {
    return a + c
}

fn mediantDen(b: u32, d: u32) -> u32 {
    return b + d
}

pub fn main(world: World) -> Void raises {
    if mediantNum(1, 1) == 2 && mediantDen(2, 3) == 5 {
        check world.out.write("stern brocot ok\n")
    }
}