#include <bits/stdc++.h>

using namespace std;


typedef long long ll;


int main()
{
    vector<vector<int>> a(300, vector<int>(300, 0));
    int x = 150;
    int y = 150;
    int n = 5;
    int k = 5;
    for(int z = 0; z < 5; ++z){
        for(int i = 0; i < n; ++i){
            a[x][y] = 1;
            --x;
        }
        for(int i = 0; i < n; ++i){
            a[x][y] = 1;
            ++y;
        }
        n += k;
        for(int i = 0; i < n; ++i){
            a[x][y] = 1;
            ++x;
        }
        for(int i = 0; i < n; ++i){
            a[x][y] = 1;
            --y;
        }
        n += k;
    }
    x = 161;
    y = 161;
    int res = 0;
    int counter = 0;
    for(int k = 1; k <= 5; ++k){
        int ans = 0;
        n = k;
        for(int z = 0; z < 5; ++z){
            for(int i = 0; i < n; ++i){
                a[x][y] = 1;
                --x;
            }
            for(int i = 0; i < n; ++i){
                a[x][y] = 1;
                ++y;
            }
            n += k;
            for(int i = 0; i < n; ++i){
                a[x][y] = 1;
                ++x;
            }
            for(int i = 0; i < n; ++i){
                a[x][y] = 1;
                --y;
            }
            n += k;
        }
        if(ans > counter){
            counter = ans;
            res = k;
        }
    }
    cout << res << endl;
}