#include <iostream>
#include <algorithm>
#include <vector>
#include <string>
#include <complex>
#include <stack>
#include <queue>
#include <unordered_map>
#define rep(i, a) for (int i = 0; i < (a); i++)
using namespace std;


int main(){
    long long int n;
    cin >> n;
    
    int i = 0;
    int pow = 1;
    
    while(pow < n){
        pow *= 2;
        i++;
    }
    
    cout << i << endl;
}