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

int main()
{
    int N;
    cin >> N;
    vector<int> A(N);
    for (int i = 0; i < N; i++)
    {
        cin >> A[i];
    }
    sort(A.begin(), A.end());
    for (int i = 0; i < N - 1; i++)
    {
        if (A[i] % 2 == A[i + 1] % 2)
        {
            continue;
        }
        else
        {
            if (A[i] + 1 < A[i + 1])
            {
                continue;
            }
        }
        cout << "2";
        return 0;
    }
    cout << 1;
}