package main

import (
	"fmt"
)

func scan() (N int) {
	fmt.Scan(&N)
	return
}

func main() {
	N := scan()
	// N := 1
	// N := 3200444

	i := 0
	numOfBiscuit := 1
	for true {
		if numOfBiscuit >= N {
			break
		}
		i++
		numOfBiscuit *= 2
	}
	fmt.Print(i)
}