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

using ll = long long;
#define rep(a, b, c) for(ll a = b; a < c; a++)

ll n;
bool f(ll i, ll j){
    ll m = 1;
    for (int k=0; k<j; k++){
        if (m >= n / i+1) return 0;
        m *= i;
    }
    return 1;
}

int main()
{
	cin >> n;
    ll ans = n;
	rep(j, 1, 61) {
        ll l = 1, r = n + 1;
        while(r - l > 1) {
            ll m = (l + r) / 2;
            bool b = f(m, j);
            if(b == 0) r = m;
            else l = m;
        }
        ll s = 1;
        rep(i, 0, j) s *= l;
        ans = min(ans, l + j + n - s); 
	}

	cout << ans << endl;
}