#include <bits/stdc++.h>
#define FOR(i,bg,ed) for(ll i=(bg);i<(ed);i++)
#define REP(i,n) FOR(i,0,n)
#define MOD 1000000007
#define int long long
using namespace std;
typedef long long ll;
const int INF = 1e9;

int N, L, H;
int C[15];

int gcd(int a, int b)
{
    if (b == 0) return a;
    return gcd(b, a % b);
}

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

int nA(int A)
{
    return H / A - (L - 1) / A;
}

int sum = 0;

void rec(int i, int cnt, int tLcm)
{
    if (i == N) {
        if (cnt % 2 == 0) {
            sum -= nA(tLcm);
        } else {
            sum += nA(tLcm);
        }
        return;
    }

    rec(i + 1, cnt + 1, lcm(tLcm, C[i]));
    rec(i + 1, cnt, tLcm);
}

signed main()
{
    cin >> N >> L >> H;
    REP(i,N) cin >> C[i];

    //cout << nA(5) << endl;
    /*
    REP(i,N) {
        sum += nA(C[i]);
    }
    */

    rec(0, 1, 1);

    cout << sum << endl;
}