#include <algorithm>
#include <array>
#include <cmath>
#include <cstdio>
#include <deque>
#include <iomanip>
#include <iostream>
#include <numeric>
#include <optional>
#include <queue>
#include <sstream>
#include <unordered_map>
#include <unordered_set>
#include <vector>

using namespace std;

int main() {
    double n;
    cin >> n;
    int64_t ans = int64_t(sqrt(n / 3));
    if (ans == 0)
        ans = 1;
    cout << ans << endl;
    return 0;
}