#include <iostream>
#include <algorithm>
#include <iomanip>
#include <vector>
#include <queue>
#include <set>
#include <map>
#include <cassert>

#define debug_value(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << #x << "=" << x << endl;
#define debug(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << x << endl;

template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }

using namespace std;
typedef long long ll;

const ll INF = 2e18;

ll pow(ll x, int n){
    ll ans = 1;
    for(int i = 0; i < n; i++){
        if(INF/x < ans) return INF;
        ans *= x;
    }
    return ans;
}

ll root_floor(ll n, ll k){
    if(n == 1) return 1;
    if(k == 1) return n;
    ll l = 1, r = n;
    while(r-l > 1){
        ll x = (l+r)/2;
        if(pow(x, k) > n) r = x;
        else l = x;
    }
    return l;
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout << setprecision(10) << fixed;
    ll n; cin >> n;
    ll ans = n;
    int x = 1;
    while(true){
        ll r = root_floor(n, x);
        ll p = pow(r, x);
        ll i = r, j = x, k = n-p;
        chmin(ans, i+j+k);
        if(r == 1) break;
        x++;
    }
    cout << ans << endl;
}