package main

import "fmt"

func main() {
	var N int
	fmt.Scan(&N)

	current := 1
	count := 0
	if N == 1 {
		fmt.Println(count)
	} else {
		for current != N {
			count++
			if current*2 >= N {
				break
			} else {
				current *= 2
			}
		}
		fmt.Println(count)
	}
}