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#include <iostream>
#include <vector>

using namespace std;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int n, k;
    cin >> n;
    cin >> k;

    vector<int> v;
    vector<int> mark;

    int a;
    for (int i = 0; i < n; i++) {
        cin >> a;
        v.push_back(a);
        mark.push_back(0);
    }
    mark.push_back(0);

    int marks = 0;
    int index = 0;
    for (int i = 0; i < n; i++) {
        a = v[i];
        if (mark[a] == 0) {
            marks++;
        }
        mark[a]++;
        if(marks == k) {
            index = i;
            break;
        }
    }

    if(marks < k) {
        cout << -1 << endl;
        return 0;
    }

    long long result = 0;
    for (int i = index; i >= 0; i--) {
        a = v[i];
        mark[a]--;
        if (mark[a] > 0) {
            result += index - i;
            index--;
        }
    }

    cout << result << endl;
    return 0;
}