#include <iostream>
#include <vector>

using namespace std;

int main(void){

  int N, H, L;
  int count = 0;
  
  cin >> N >> L >> H;

  vector<int> C;
  for (int i = 0; i < N; i++){
    int x;
    cin >> x;
    C.push_back(x);
  }

  for (int i = L; i < H+1; i++) {
    int flag = 0;
    for (int j = 0; j < N; j++) {
      if (i%C[j] == 0) {
        flag += 1;
      }
    }
    if (flag == 1) {
      count += 1;
    }
  }

  cout << count << endl;

  return 0;
}