import java.io.FileNotFoundException;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws FileNotFoundException {
		new Main().run();
	}

	void run() {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		long L = sc.nextLong();
		long H = sc.nextLong();
		long[] c = new long[n];
		for (int i = 0; i < n; ++i) {
			c[i] = sc.nextLong();
		}

		System.out.println(calc(H, c, n) - calc(L - 1, c, n));
	}

	long calc(long v, long[] c, int n) {
		long ans = 0;
		out: for (int s = 1; s < 1 << n; ++s) {
			long f = 1;
			for (int i = 0; i < n; ++i) {
				if ((s & (1L << i)) > 0) {
					f = lcm(f, c[i]);
					if (f < 0) {
						continue out;
					}
				}
			}
			if (Integer.bitCount(s) % 2 == 1) {
				ans += v / f * Integer.bitCount(s);
			} else {
				ans -= v / f * Integer.bitCount(s);
			}
		}
		return ans;
	}

	long lcm(long a, long b) {
		return a / gcd(a, b) * b;
	}

	long gcd(long a, long b) {
		if (a < b) {
			long tmp = a;
			a = b;
			b = tmp;
		}
		if (b == 0) {
			return a;
		}
		return gcd(a % b, b);
	}

	void tr(Object... objects) {
		System.out.println(Arrays.deepToString(objects));
	}
}