define a(i,j) {
        scale=0
        if(i%2 ==0) return i;
        if(j-i>=0.5) return i+1;
        return i-1;
}

define x(w,h,n) {
	scale=20
	f=w/n
	scale=0
	i=h/f
	scale=1
	j=h/f
	return a(i,j);
}

x(720,576,600)