import java.io.*;
import java.util.StringTokenizer;

/**
 * Date: 2025/1/22 14:14
 */
public class Main {

    public static void main(String[] args) {
        int n = sc.nextInt(), l = sc.nextInt(), r = sc.nextInt();
        int[] a = new int[n];
        for (int i = 0; i < n; i++) {
            a[i] = sc.nextInt();
        }
        long ans = f(a, n, r) - f(a, n, l - 1);
        out.println(ans);
        out.close();
    }

    static long f(int[] a, int n, int t) {
        long ans = 0;
        for (int s = 1; s < 1 << n; s++) {
            int bit = Integer.bitCount(s);
            long v = 1;
            for (int i = 0; i < n; i++) {
                if ((s >> i & 1) == 1) v = getLCM(v, a[i]);
            }

            if (bit % 2 == 1) {
                ans += bit * (t / v);
            } else {
                ans -= bit * (t / v);
            }
        }
        return ans;
    }

    //求 a 和 b 的最大公约数,做法：辗转相除法
    static long getGCD(long a, long b) {
        if (b == 0) return a;
        if (a % b == 0) return b;
        return getGCD(b, a % b);
    }


    //求 a 和 b 的最小公倍数, lcm * gcd = a * b
    static long getLCM(long a, long b) {
        return a * b / getGCD(a, b);
    }

    static Kattio sc = new Kattio();
    static PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));

    static class Kattio {
        static BufferedReader r;
        static StringTokenizer st;

        public Kattio() {
            r = new BufferedReader(new InputStreamReader(System.in));
        }

        public String next() {
            try {
                while (st == null || !st.hasMoreTokens()) {
                    st = new StringTokenizer(r.readLine());
                }
                return st.nextToken();
            } catch (Exception e) {
                return null;
            }
        }

        public int nextInt() {
            return Integer.parseInt(next());
        }

        public long nextLong() {
            return Long.parseLong(next());
        }

        public double nextDouble() {
            return Double.parseDouble(next());
        }
    }
}