#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<int,int>;
#define rep(i, n) for(int i = 0; i < n; i++)
#define all(x) (x).begin(),(x).end()

int main(){
    ll n;
    cin >> n;
    ll ans = 1LL<<60;
    for(ll i=2;i<=ans;i++){
        ll x = 1, cnt = 0;
        while(x<=n/i){
            x *= i;
            cnt++;
        }
        ans = min(ans, i+cnt+n-x);
    }
    cout << ans << endl;
    return 0;
}