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#include <iostream>
#include <vector>

using namespace std;

int main(){

    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    int n,k;
    cin >> n >> k;

    vector<bool> unique(n+1);
    int indeks{};
    
    long long wynik{};
    bool is_good = false;

    for(int x,i =0; i < n; ++i)
    {
        cin >> x;

        if(unique[x] == false)
        {
            unique[x] = true;

            if(indeks != i)
                wynik += i - indeks;
            
            ++indeks;

            if(indeks == k)
            {
                is_good = true;
                break;
            }
        } 
    }
    
    if(is_good) cout << wynik;
    else cout << -1;

    return 0;
}