#include<bits/stdc++.h>
using ll = long long;
using namespace std;

int main(){
	cin.tie(0);
	ios::sync_with_stdio(false);
	ll a;cin >> a;
	ll miku = 1;
	int ans = 0;
	while(miku < a){
		ans++;
		miku *= 2;
	}
	ll miku2 = 1;
	int ans2 = 0;
	while(miku2 < a){
		ans2++;
		miku2 *= 3;
	}
	cout << min(ans*2,ans2*3) << endl;
	return 0;
}