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// B1 - Oranzada
#include <iostream>
using namespace std;

int main() {
	ios_base::sync_with_stdio(0);
	int n, k, a;
	int brandsUsed;
	long long result;
	bool *isNew;
	
	cin >> n;
	cin >> k;
	
	isNew = new bool[n];
	for (int i = 0; i < n; ++i) {
		isNew[i] = true;
	}
	
	result = 0;
	brandsUsed = 0;
	for (int i = 0; i < n; ++i) {
		cin >> a;
		--a;
		
		if((brandsUsed < k) && isNew[a]) {
			result += (i - brandsUsed);
			isNew[a] = false;
			++brandsUsed;
		}
	}
	
	if (brandsUsed < k) {
		cout << -1;
	} else {
		cout << result;
	}
	
	delete [] isNew;
	
	return 0;
}