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#include <iostream>
#include <algorithm>

using namespace std;

int main() {
	int n = 0; int dlugosc_ciagu = 0;
	cin >> n >> dlugosc_ciagu;
	int tablica[n]; int ciag[n]; int wazna[n]; int  sumka = 0;
	for(int i = 0; i < n;i++)
	{
		ciag[i] = 0;
	}
	for(int i = 0; i < n;i++)
	{
		cin >> tablica[i];
		if(ciag[tablica[i]-1]==0)
		{
			wazna[i] = 1;
			sumka += 1;
		}
		else
		{
			wazna[i] = 0;
		}
		ciag[tablica[i]-1] = 1;
	}
	int wynik = 0;
	if(dlugosc_ciagu > sumka)
	{
		cout << -1;
	}
	else
	{
		for(int h = 0; h <dlugosc_ciagu;h++)
		{
			if(wazna[h]==0)
			{
				for(int i = h+1; i < n; i++)
				{
					if(wazna[i]==1)
					{
						wynik += i - h;
						wazna[i] = 0;
						break;
					}
				}
			}
		}
		cout << wynik;
	}
	return 0;
}