fun main(): u0 {
    var a = 1;
    var b = 1;
    while(233 - a) {
        draw_number(a, 24, 13);
        set_delay(30);
        var temp = a;
        a = b;
        b = b + temp;
        while(get_delay()){}
        draw_number(temp, 24, 13);
    }
    draw_number(a, 24, 13);
}