#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < n; i++)
using namespace std;

typedef long long ll;

int main() {
    ll A;
    cin >> A;
    int ans = 1e9;
    ll x = A;
    int M = 0;
    while (x > 1) {
        x = (x + 1) / 2;
        M++;
    }
    ans = min(ans, 2 * M);
    x = A;
    M = 0;
    while (x > 1) {
        x = (x + 2) / 3;
        M++;
    }
    ans = min(ans, 3 * M);
    cout << ans << "\n";
}