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#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n,k;
    cin>>n>>k;
    vector<int> bottles(n);
    for(int i = 0; i < n; i++)
        cin>>bottles[i];

    vector<bool> czy(n+1);
    czy[bottles[0]] = true;
    int how_many = 1;
    int result = 0;
    for(int i = 1; i < bottles.size() && how_many < k; i++){
        if(!czy[bottles[i]]){
            result += abs(i - (int)how_many);
            czy[bottles[i]] = true;
            how_many++;
        }
    }
    if(how_many == k)
        cout<<result<<endl;
    else
        cout<<-1<<endl;
    return 0;
}