func main()
	var _: [][]char :: cui@input().split(" ")
	var A: int :: _[0].toInt(&)
	var B: int :: _[1].toInt(&)
	var d: []int :: #[32]int
	var ans: int
	for i(23, 25)
		do d[i] :: 1
	end for
	for i(A, B)
		do d[i] :: 0
	end for
	for i(23, 25)
		do ans :+ d[i]
	end for
	do cui@print("\{ans}\n")
end func