func main()
	var a: int :: cui@inputInt()
	var b: int :: cui@inputInt()
	do a :% 12
	do a :: a * 3600 + b * 60
	var ans: int :: a
	for i(11, 0, -1)
		var t: float :: 12.0 * 3600.0 * i $ float / 11.0
		if(t < a $ float)
			break i
		end if
		do ans :: t $ int - a
	end for
	
	do cui@print("\{ans}\n")
end func