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#include <iostream>
#include <vector>

using namespace std;

int main() {
    int k, n, brandNum, goodBottles = 0, result=0;
    cin>>n;
    cin>>k;
    
    vector<bool> bottles(n +1,false);

    for (int i = 0; i < n; i++) {
        cin>>brandNum;
        if (goodBottles == k) continue;
        
        if (bottles.at(brandNum) == false) {
            bottles.at(brandNum) = true;
            result = result + (i - goodBottles);
            goodBottles++;
        }
    }
    if (goodBottles < k) {
        cout<<-1<<endl;
    } else {
        cout<<result<<endl;
    }

    return 0;
}