#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef pair<ll,ll> P;
typedef vector<ll> VI;
typedef vector<VI> VVI;
#define REP(i,n) for(ll i=0;i<(n);i++)
#define ALL(v) v.begin(),v.end()
template<typename T> bool chmax(T &x, const T &y) {return (x<y)?(x=y,true):false;};
template<typename T> bool chmin(T &x, const T &y) {return (x>y)?(x=y,true):false;};
constexpr ll MOD=998244353;
constexpr ll INF=2e18;

ll p(ll x, ll y){
    ll res=1;
    REP(i,y) res*=x;
    return res;
}

int main(){
    ll n; cin >> n;
    double eps=1e-8;
    ll ans=n;
    for(int i=1;i<=60;i++){
        double r=pow(n,(double)1/i)+eps;
        ll x=r;
        chmin(ans,n-p(x,i)+i+x);
        if(x>0){
            x--;
            chmin(ans,n-p(x,i)+i+x);
        }
    }
    cout << ans << endl;
    return 0;
}