#include <bits/stdc++.h>
using namespace std;
using ll = long long;


int main() {
    ll n,ans,val,lim,k;
    cin >> n;
    lim = 1000000000000;
    ans = 1000000000000000000;
    for (ll i=1; i<=1000000;i++){
        for (ll j=1; j<=50;j++){
            if (pow(i,j) > min(lim,n)){
                break;
            }
            k = i+j+n-(pow(i,j));
            ans = min(ans,k);
        }
    }
    cout << ans << endl;
}