#include <iostream>
#include <vector>
using namespace std;

int main() {
    int N, L, H;
    cin >> N;
    cin >> L;
    cin >> H;

    vector<int> v(N);
    for(int i = 0; i < N; i++) cin >> v[i];

    int count = 0;
    for(int i = L; i <= H; i++) {
        int x = 0;
        for(auto &c : v) {
            if(!(i%c)) x++;
        }
        if (x == 1) count++;
    }
    cout << count;
}