func main()
	var a: int :: cui@inputInt()
	var b: int :: cui@inputInt()
	var c: int :: cui@inputInt()
	var d: int :: cui@inputInt()
	
	var diff: int :: 31 + b - a
	
	var ans: int :: 3
	if(c <= diff)
		do ans :: 1
	elif(d <= diff)
		do ans :: 2
	end if
	do cui@print("\{ans}\n")
end func