#include <bits/stdc++.h>

using namespace std;

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

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

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);

  int n;
  long long l, h;
  cin >> n >> l >> h;
  vector<long long> c(n);
  for (int i = 0; i < n; i++)
    cin >> c[i];

  long long ret = 0;
  for (int mask = 0; mask < 1<<n; mask++) {
    int b = __builtin_popcountll(mask);
    long long x = 1;
    for (int i = 0; i < n; i++) {
      if (mask & 1 << i) {
        x = lcm(x, c[i]);
        if (x > h)
          break;
        b *= -1;
      }
    }
    if (x <= h) {
      b *= -1;
      ret += h / x * b;
      ret -= (l-1) / x * b;
    }
  }
  cout << ret << endl;
  
  return 0;
}