#include<bits/stdc++.h>
#include<random>
using namespace std;
#define int long long
#define REP(i,m,n) for(int i=(m);i<(n);i++)
#define rep(i,n) REP(i,0,n)
#define pb push_back
#define all(a) a.begin(),a.end()
#define rall(c) (c).rbegin(),(c).rend()
#define mp make_pair
#define endl '\n'
//#define vec vector<ll>
//#define mat vector<vector<ll> >
#define fi first
#define se second
#define double long double
typedef long long ll;
typedef unsigned long long ull;
typedef pair<ll,ll> pll;
//typedef long double ld;
typedef complex<double> Complex;
const ll INF=1e9+7;
const ll MOD=998244353;
const ll inf=INF*INF;
const ll mod=INF;
const ll MAX=1000010;
const double PI=acos(-1.0);
typedef vector<vector<ll> > mat;
typedef vector<ll> vec;


signed main(){
    ll n;cin>>n;
    //j=0
    ll ans=n;
    //j>=2;
    REP(j,2,64){
        ll l=1,r=inf;
        while(r-l>1){
            ll mid=(r+l)/2;
            ll d=1;
            bool f=1;
            rep(i,j){
                if(n/mid<d)f=0;
                d=d*mid;
            }
            if(f)l=mid;
            else r=mid;
        }
        ll d=1;
        rep(i,j){
            d=d*l;
        }
        ans=min(ans,l+j+n-d);
    }
    cout<<ans<<endl;
}