//#include <tourist>
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> p;
const int INF = 1e9;
const ll LINF = ll(1e18);
const int MOD = 1000000007;
const int dx[4] = {0, 1, 0, -1}, dy[4] = {-1, 0, 1, 0};
const int Dx[8] = {0, 1, 1, 1, 0, -1, -1, -1}, Dy[8] = {-1, -1, 0, 1, 1, 1, 0, -1};
#define yes cout << "Yes" << endl
#define YES cout << "YES" << endl
#define no cout << "No" << endl
#define NO cout << "NO" << endl
#define rep(i, n) for (int i = 0; i < n; i++)
#define ALL(v) v.begin(), v.end()
#define debug(v)          \
    cout << #v << ":";    \
    for (auto x : v)      \
    {                     \
        cout << x << ' '; \
    }                     \
    cout << endl;
template <class T>
bool chmax(T &a, const T &b)
{
    if (a < b)
    {
        a = b;
        return 1;
    }
    return 0;
}
template <class T>
bool chmin(T &a, const T &b)
{
    if (b < a)
    {
        a = b;
        return 1;
    }
    return 0;
}
//cout<<fixed<<setprecision(15);有効数字15桁
//-std=c++14
//-std=gnu++17
ll gcd(ll a, ll b) { return b ? gcd(b, a % b) : a; }
ll lcm(ll a, ll b) { return a / gcd(a, b) * b; }
ll n, m;
vector<int> a, b;
int main()
{
    cin.tie(0);
    ios::sync_with_stdio(false);
    cin >> n;
    a.resize(n);
    rep(i, n) cin >> a[i];
    rep(i, n - 1)
    {
        if (a[i] != a[i + 1])
        {
            b.push_back(a[i]);
        }
    }
    bool check = false;
    if(b.size()==0)return cout<<0<<"\n",0;
    if (a[0] != a.back())
    {
        b.push_back(a.back());
        check = true;
    }
    set<int> s;
    rep(i, b.size()) s.insert(b[i]);
    if (s.size() == b.size()&&check){
        cout<<0<<"\n";
    }
    else if (s.size() == b.size()){
        cout << 1 << "\n";
    }
    else cout<<-1<<"\n";
}