#include <iostream>
using namespace std;

int main() {
	int n, m, k, a, MIN, MAX;
	unsigned long rez = 1;
	cin >> n >> m >> k;
	MIN = min(m, k);
	MAX = max(m, k);
	for (int i = 1; i <= MAX; i++) {
		cin >> a;
		if (i >= MIN) rez *= a;
	}
	cout << rez;
	return 0;
}