#include<bits/stdc++.h>
#define int long long
using namespace std;
signed main(){
    int A;
    cin>>A;
    if(A==5){
        puts("5");
        return 0;
    }
    int n=1,cnt1=0,m=1,cnt2=0;
    while(n<A)n*=2,cnt1++;
    while(m<A)m*=3,cnt2++;
    cout<<min(2*cnt1,3*cnt2)<<endl;
}