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

template <typename T>
T gcd(T a, T b) {
	while (b) {
		T tmp = b;
		b = a % b;
		a = tmp;
	}
	return a;
}

template <typename T>
T lcm(T a, T b) {
	return a / gcd(a, b) * b;
}

int main() {
	int64_t n, a, b;
	cin >> n >> a >> b;
	int64_t c[n];
	for (auto &i : c) {
		cin >> i;
	}
	auto f = [&](int64_t x) {
		int64_t ans = 0;
		for (int i = 1; i < (1 << n); i++) {
			int64_t l = 1, count = 0;
			for (int j = 0; j < n; j++) {
				if ((i >> j) & 1) {
					l = lcm(l, c[j]);
					count++;
					if (x < l) {
						goto next;
					}
				}
			}
			ans += count * max(int64_t(0), x / l) * pow(-1, count + 1);
			next:;
		}
		return ans;
	};
	cout << f(b) - f(a - 1) << endl;
	return 0;
}