#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (n); i++)
using namespace std;
using ll = long long;
using pii = pair<int, int>;

int main() {
  int n;
  cin >> n;
  for (int i = 0; i <= 30; i++) {
    if (n <= (1 << i)) {
      cout << i << endl;
      break;
    }
  }
  return 0;
}