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

int main() {
    ll A;
    cin >> A;
    if(A<=5){
        cout << A << endl;
        return 0;
    }
    ll num = 1;
    ll ans2 = 0;
    while(num<A){
        num*=2;
        ans2 += 2;
    }

    num = 1;
    ll ans3 = 0;
    while(num<A){
        num*=3;
        ans3 += 3;
    }
    cout << min(ans2,ans3) << endl;


    return 0;
}