#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (n); ++i)

using std::cin; 
using std::cout;
using std::vector;
using vi = vector<int>;
using vvi = vector<vi>;
using ll = long long;

ll mpow(ll x, ll y) {
	ll res = 1;
	while (y) {
		if (y & 1) res *= x;
		x *= x;
		y >>= 1;
	}
	return res;
}

void chmin(ll &x, ll y) { if (x > y) x = y; }

int main() {
	ll n;
	cin >> n;
	
	ll ans = n;
	for (int j = 1; j <= std::__lg(n); ++j) {
		ll i = pow(n, 1.0 / j);
		while (pow(i + 1, j) <= n) i++;
		ll k = n - mpow(i, j);
		ll now = i + j + k;
		chmin(ans, now);
	}
	
	cout << ans << '\n';
	
	return 0;
}