#include<iostream>
using namespace std;
int dp[1000001];
int main() {
	int n;
	cin >> n;
	dp[1] = 0;
	for (int i = 2; i <= n; i++) {
		dp[i] = min(dp[i - 1] + 1, dp[i / 2] + 1);
	}
	cout << dp[n];
	return 0;
}

样例都没过qwq