void lucas_number (int x, int y, int num)
{
    int z;
    z=0;
    while(num >= x) {
        print_int(x);
        print(", ");
        z=x+y;
        x=y;
        y=z;
    }
}

int main()
{
    int x;
    int y;
    int num;
    print("Enter the limit of the Lucas number:");
    print_nl();
    x=2;
    y=1;
    num= read_int();
    print("The Lucas numbers are: ");
    lucas_number(x, y, num);
    print_nl();

    return 0;
}