#include <iostream>
using namespace std;
int main(){
    long long A;
    cin >> A;
    long long cnt = 0, cnt2;
    long long t = A;
    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;
}