#include <bits/stdc++.h>
#define debug(x) cerr << #x << ": " << x << endl
#define debugArray(x, n)                           \
  for (long long hoge = 0; (hoge) < (n); ++(hoge)) \
  cerr << #x << "[" << hoge << "]: " << x[hoge] << endl
using namespace std;

long long lcm(long long x, long long y) { return x * y / __gcd(x, y); }

signed main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  long long N, L, H;
  cin >> N >> L >> H;
  int C[N];
  for (int i = 0; i < N; i++) cin >> C[i];
  long long ans = 0;
  for (int bit = 0; bit < (1 << N); bit++) {
    int cnt = __builtin_popcount(bit);
    long long mul = 1;
    for (int i = 0; i < N; i++)
      if ((bit >> i) & 1) mul = lcm(mul, C[i]);
    long long tmp = H / mul - (L - 1) / mul;
    if (cnt & 1)
      ans += cnt * tmp;
    else
      ans -= cnt * tmp;
  }
  cout << ans << endl;
  return 0;
}