#include <iostream>
#include <vector>
#include <map>
using namespace std;
int main(){
    long long A;
    cin >> A;
    long long cnt = 0, cnt2 = 0;
    long long t = A;
    long long temp1 = 1;
    long long c = 0;
    while(A > temp1){
        temp1 *= 2;
        c++;
        if(A == temp1){
            cout << c * 2 << endl;
            return 0;
        }
    }
    temp1 = 1;
    c = 0;
    while(A > temp1){
        temp1 *= 3;
        c++;
        if(A == temp1){
            cout << c * 3 << endl;
            return 0;
        }
    }
    while(t > 0){
        t /= 2;
        cnt++;
    }
    long long t1 = cnt * 2;
    while(A > 0){
        A /= 3;
        cnt2++;
    }
    long long t2 = cnt2 * 3;
    cout << min(t1, t2) << endl;
}