#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <vector>
using namespace std;

const int N = (int)1e6 + 10;
vector<int> g[N];
int dp[N];
int L;

int main()
{
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);

    for (int v = 2; v * v < N; v++)
    {
        for (int u = 1; u < v; u++)
        {
            int x = v * v - u * u;
            int y = 2 * v * u;
            int z = v * v + u * u;
            for (int k = 1; k * z < N; k++)
            {
                g[x * k].push_back(z * k);
                g[y * k].push_back(z * k);
            }
        }
    }
    for (int x = 1; x < N; x++)
        for (int y : g[x])
            dp[y] = max(dp[y], dp[x] + 1);
    cin >> L;
    cout << dp[L];

    return 0;
}