#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef unsigned long long ull;
#define REP(i, n) for(int i=0; i<n; i++)
#define REPi(i, a, b) for(int i=int(a); i<int(b); i++)
#define MEMS(a,b) memset(a,b,sizeof(a))
#define mp make_pair
#define MOD(a, m) ((a % m + m) % m)
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }
const ll MOD = 1e9+7;

ll N, L, H;

ll lcd(ll a, ll b){
    ll g = gcd(a, b);
    return g * a/g * b/g;
}

void dfs(ll idx, ll num, ll val, ll& ans, auto& C){
    if(idx == N){
        if(num == 0) return;
        ll x = H/val - (L-1)/val;
        if(num % 2) ans += num*x;
        else ans -= num*x;
        return;
    }

    dfs(idx+1, num, val, ans, C);
    dfs(idx+1, num+1, lcd(val, C[idx]), ans, C);
}

int main(){
    cin >> N >> L >> H;
    vector<ll> C(N);
    for(auto& c : C)
        cin >> c;

    ll ans = 0;

    dfs(0, 0, 1, ans, C);

    cout << ans << endl;

    return 0;
}