#include <bits/stdc++.h>
using namespace std;

int main() {
	long long n, k, b, ln = -1;
    cin >> n >> k >> b;
    vector <long long> a (n, 0);
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }
    sort(a.begin(), a.end());
    for (int i = 0; i < n; i++) {
        if (a[i] < 0) {
            ln = i;
        }
    }

    if (b > ln+1) {
        cout << -1;
        return 0;
    }
    while (b < ln+1) {
        if (k >= -1*a[ln]) {
            k += a[ln];
            a[ln] = 0;
            ln--;
        } else {
            cout << -1;
            return 0;
        }
    }
    long long p = ln+1;
    while (k > 0) {
        a[p]++;
        k--;
        if (p+1 != n) {
            if (a[p+1] < a[p]) {
                p++;
            } else {
                p = ln + 1;
            }
        } else {
            p = ln + 1;
        }
    }

    long long s = 1;
    for (int i = 0; i < n; i++) {
        s *= abs(a[i]);
        s = s % 1000000007;
    }
    cout << s;
	return 0;
}