func main()
	var n: int :: cui@inputInt()
	var w: int :: cui@inputInt()
	
	var ans: int :: -1
	for(1, n)
		var v: int :: cui@inputInt()
		var wi: int :: cui@inputInt()
		if(wi <= w & v > ans)
			do ans :: v
		end if
	end for
	
	do cui@print("\{ans}\n")
end func