method f1(a b)
	return a - (b * -3);
end;

method f2(a b)
	return a - (b * 2);
end;

method f3(a b)
	return a - (b * 5);
end;

method  f(a b c d)
        return a - ((b - ((c - (d * -3)) * -4)) * 8);
end;