/* -*- coding: utf-8 -*-
 *
 * 546.cc: No.546 オンリー・ワン - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

const int MAX_N = 10;

/* typedef */

typedef long long ll;

/* global variables */

int cs[MAX_N];

/* subroutines */

ll count(int n, ll h) {
  int nbits = 1 << n;
  ll cnt = 0;

  for (int bits = 1; bits < nbits; bits++) {
    ll lcm = 0;
    int bn = 0;

    for (int i = 0, bi = 1; i < n; i++, bi <<= 1)
      if (bits & bi) {
	bn++;
	lcm = (lcm == 0) ? cs[i] : lcm * cs[i] / __gcd(lcm, (ll)cs[i]);
	if (lcm > h) break;
      }
    if (lcm > h) continue;

    cnt += h / lcm * bn * ((bn & 1) ? 1 : -1);
  }

  return cnt;
}

/* main */

int main() {
  int n;
  ll l, h;
  cin >> n >> l >> h;
  for (int i = 0; i < n; i++) cin >> cs[i];

  ll ans = count(n, h) - count(n, l - 1);
  printf("%lld\n", ans);
  return 0;
}