#include <iostream>
#include <cmath>

using namespace std;

int main(){

    long long a;
    cin>>a;
    
    long long cur=1,m=0,ans;
    while(cur<a){
        cur*=2;
        m++;
    }
    ans=2*m;
    m=0;
    cur=1;
    while(cur<a){
        cur*=3;
        m++;
    }
    ans=min(ans,3*m);

    cout<<ans<<endl;

    return 0;
}