#include<bits/stdc++.h>
#define rep(i, n) for(int i = 0; i < (int)(n); i++)
using namespace std;
typedef long long ll;
int INF = (1LL << 30) - 1;
int MOD = 1e9+7;
ll gcd (ll a,ll b){
    return b ? gcd(b,a%b) : a;
}
ll lcm(vector<ll> V){
    ll l = V[0];
    for(auto i:V){
        l = l / gcd(l,i) * i;
    }
    return l;
}
main(){
    ll N,L,H;
    cin >> N >> L >> H;
    vector<ll> C(N);
    rep(i,N)cin >> C[i];
    ll ans = 0;
    rep(i,1 << N){
        if(!i)continue;
        int bit = __builtin_popcountll(i);
        vector<ll> V;
        rep(j,N){
            if(i & (1 << j)){
                V.push_back(C[j]);
            }
        }
        auto l = lcm(V);
        ll cnt = H / l - (L-1) / l;
        //cout << cnt << endl;
        ans += (bit&1 ? cnt * bit : -cnt * bit);
    }
    cout << ans << endl;
}