#include <iostream>
using namespace std;

int main() {
  // 入力
  int N;
  cin >> N;

  int ans = 0;
  int n = 1;
  while (2 * n <= N) {
    n *= 2;
    ans++;
  }

  // 解答
  if (N - n == 0) {
    cout << ans << endl;
  } else {
    cout << ans + 1 << endl;
  }

  return 0;
}