#include <iostream>
#include <vector>
#include <algorithm>
#define REP(i, n) for(int i = 0; i < (int)(n); i++)
#define print(x) cout << x << endl;
using namespace std;
const int MOD = (int)1e9 + 7;
int main(void){
    cin.tie(0);
    ios::sync_with_stdio(false);
    
    int N;
    cin >> N;
    int ans = 0;
    int n = 1;
    REP(i, n){
        n *= 2;
        ans += 1;
        if(n >= N){break;}
    }
    
    print(ans);
    return 0;
}