func main()
	var x: int :: cui@inputInt()
	var y: int :: cui@inputInt()
	var x2: int :: cui@inputInt()
	var y2: int :: cui@inputInt()
	var ans: int :: [x, y].max()
	if(x = y & x2 = y2 & x2 < x)
		do ans :+ 1
	end if
	do cui@print("\{ans}\n")
end func