#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <algorithm>
#include <iostream>
#include <map>
#include <vector>
#include <queue>

using namespace std;
//namaega 184
int main(){
	
	int n;
	scanf("%d",&n);//%d%d%d%d",&n,&v,&x,&y,&ax,&ay);
	int ans=0;
	unsigned long long a=1;
	
	while(n>a){a<<=1;ans++;}
	printf("%d\n",ans);
	
	return 0;
}