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#include <iostream>

const int N = 500005;

bool usedCompany[N];

int main() {

    int n, k;
    std::cin >> n >> k;

    int bottlesUsed = 0;
    int movesRequired = 0;
    for (int i = 0; i < n && bottlesUsed < k; i++) {
        int p;
        std::cin >> p;

        if (!usedCompany[p]) {
            usedCompany[p] = true;
            movesRequired += i - bottlesUsed;
            bottlesUsed++;
        } 
    }

    if (bottlesUsed == k) {
        std::cout << movesRequired;
    } else {
        std::cout << -1;
    }

    return 0;
}