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#include <bits/stdc++.h>

using namespace std;

constexpr int max_n = 5e5 + 5;

int cnt[max_n], tab[max_n];

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int koniec = -1, n, k, ans = 0, nowe = 0, usuniete = 0;
    cin >> n >> k;
    for (int i = 0; i < n; i++){
        cin >> tab[i];
        cnt[tab[i]]++;
        if (cnt[tab[i]] == 1)
            nowe++;
        if (nowe == k)
            koniec = i;
    }
    if (koniec == -1){
        cout << "-1\n";
        return 0;
    }
    for (int i = 1; i <= n; i++)
        cnt[i] = 0;
    for (int i = 0; i < n; i++){
        cnt[tab[i]]++;
        if (cnt[tab[i]] != 1){
            ans += koniec - i - usuniete;
            usuniete++;
        }
    }
    cout << ans << "\n";
    return 0;
}