#include <iostream>
#include <fstream>
#include <cstdio>
#include <cmath>
#include <vector>
#include <cstring>
#include <string>
#include <set>
#include <map>
#include <stack>
#include <queue>
#include <algorithm>
using namespace std;

#define REP(i,n) for(int i=0; i<n; ++i)
#define FOR(i,a,b) for(int i=a; i<=b; ++i)
#define FORR(i,a,b) for (int i=a; i>=b; --i)
#define ALL(c) (c).begin(), (c).end()

typedef long long ll;
typedef vector<int> VI;
typedef vector<ll> VL;
typedef vector<VI> VVI;
typedef vector<VL> VVL;
typedef pair<int,int> P;
typedef pair<ll,ll> PL;

int main() {
    ll n, l, h;
    cin >> n >> l >> h;
    VL c(n);
    REP(i,n) cin >> c[i];

    ll ans = 0;

    FOR(i,1,(1<<n)-1){
        int x = 0;
        REP(j,n) x += ((i >> j) & 1);
        ll m = -1;
        double mm;
        REP(j,n){
            if ((i >> j) & 1){
                if (m == -1) m = mm = c[j];
                else{
                    ll d = __gcd(m, c[j]);
                    m *= c[j] / d;
                    mm *= c[j] / d;
                    if (mm > h) break;
                }
            }
        }
        if (mm > h) continue;
        ll p = h / m - (l - 1) / m;

        // cout << i << " " << m << " " << p << endl;

        if (x % 2 == 1) ans += x * p;
        else ans -= x * p;

    }

    cout << ans << endl;

    return 0;
}