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#include <iostream>
#include <set>
using namespace std;

int main()
{
    set<int> brands;
    int n, k, left_counter = 0, turns = 0, next_bottle;
    cin >> n >> k;

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

        if (brands.count(next_bottle) == 0)
        {
            //New brand
            brands.insert(next_bottle);
            turns += i - left_counter;
            left_counter++;
        }

        if (left_counter >= k) break;
    }

    cout << ((left_counter >= k) ? turns : -1);

    return 0;
}