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

long long n, m = 1e18;

int main()
{
	cin >> n;

	for (long long i = 2; i <= sqrt(n); i++) {
		int j = 1;
		long long u = i;

		while (u <= n / i) {
			u *= i;
			j++;
		}

		m = min(m, i + j + n - u);

		if (n - u < i)
			break;
	}

	cout << m << endl;
}