func main()
	var ss: [][]char :: cui@input().split(" ")
	var x0: int :: ss[0].toInt(&) * 1000
	var y0: int :: ss[1].toInt(&) * 1000
	var h0: int :: ss[2].toInt(&)
	var ans1: int :: 0
	var ans2: int :: 0
	var x: int
	var y: int
	var h: int
	do x :: x0
	do y :: y0
	do h :: h0
	while(x > h)
		do h :* 4
		do y :* 2
		do ans1 :+ 1
	end while
	while(y > h)
		do h :* 4
		do x :* 2
		do ans1 :+ 1
	end while
	
	do x :: x0
	do y :: y0
	do h :: h0
	while(y > h)
		do h :* 4
		do x :* 2
		do ans2 :+ 1
	end while
	while(x > h)
		do h :* 4
		do y :* 2
		do ans2 :+ 1
	end while
	var ans: int :: [ans1, ans2].max()
	do cui@print("\{ans}\n")
end func