#include<stdio.h>
#include<iostream>
#include<algorithm>
#include<vector>
#include<string>
#include<utility>
#include<map>
#include<set>
#include<queue>
#include<stack>
#include<functional>
#include<math.h>
#include<random>
#include <bitset>
#include <cassert>
#include <complex>
using namespace std;
#define N (1000000000+7)
//#define N 998244353
#define INF 1e16
typedef long long ll;
typedef pair<int,int> P;
const int inf = 1e8;


int main() {
    ll A;
    cin>>A;
    ll ans = A;
    ll t = 1;
    ll num = 0;
    while(t<A){
        t*=2LL;
        num++;
    }
    ans = min(ans,num*2LL);
    t = 1;
    num = 0;
    while(t<A){
        t*=3LL;
        num++;
    }
    ans = min(ans,num*3LL);
    t = 1;
    num = 0;
    while(t<A){
        t*=5LL;
        num++;
    }
    ans = min(ans,num*5LL);
    t = 1;
    num = 0;
    while(t<A){
        t*=7LL;
        num++;
    }
    ans = min(ans,num*7LL);
    t = 1;
    num = 0;
    while(t<A){
        t*=13LL;
        num++;
    }
    ans = min(ans,num*13LL);
    cout<<ans<<endl;
}