#include "bits/stdc++.h" using namespace std; #define ll long long #define vi vector #define vvi vector #define pi pair #define mp make_pair #define pb push_back #define MOD 1e9 + 7 #define PAI 3.1415 #define all(x) (x).begin(),(x).end() #define chmax(x,y) x = max(x,y) #define chmin(x,y) x = min(x,y) #define pr(x) cout << x << endl #define Endl endl #define rep(i,n) for(int i = 0 ; i < n; i++) const int dx[4] = {1,0,-1,0}; const int dy[4] = {0,1,0,-1}; const int ddx[8] = {-1,0,1,-1,1,-1,0,1}; const int ddy[8] = {-1,-1,-1,0,0,1,1,1}; const int inf = 99999999; const ll linf = 1LL << 62; ll gcd(ll a,ll b){ if(a < b)swap(a , b); if(a % b == 0) return b; else gcd(b, a%b); } ll lcm(ll a,ll b){ if(a < b)swap(a , b); return (a/gcd(a , b)) * b; } int main(){ ll n; cin >> n; vector vl(27); for(int i = 0; i < 27; i++){ vl[i] = pow(2,i); if(vl[i] >= n){ pr(i); return 0; } } return 0; }