#include<iostream>
#include<string>
#include<cstdio>
#include<vector>
#include<cmath>
#include<algorithm>
#include<functional>
#include<iomanip>
#include<queue>
#include<ciso646>
#include<random>
#include<map>
#include<set>
#include<complex>
#include<bitset>
#include<stack>
#include<unordered_map>
#include<utility>
#include<tuple>
using namespace std;
typedef long long ll;
typedef unsigned int ui;
const ll mod = 1000000007;
const ll INF = (ll)1000000007 * 1000000007;
typedef pair<int, int> P;
#define stop char nyaa;cin>>nyaa;
#define rep(i,n) for(int i=0;i<n;i++)
#define per(i,n) for(int i=n-1;i>=0;i--)
#define Rep(i,sta,n) for(int i=sta;i<n;i++)
#define Per(i,sta,n) for(int i=n-1;i>=sta;i--)
#define rep1(i,n) for(int i=1;i<=n;i++)
#define per1(i,n) for(int i=n;i>=1;i--)
#define Rep1(i,sta,n) for(int i=sta;i<=n;i++)
typedef long double ld;
typedef complex<ld> Point;
const ld eps = 1e-8;
const ld pi = acos(-1.0);
typedef pair<ll, ll> LP;

ll gcd(ll a,ll b){
  if(a<b) swap(a,b);
  if(b==0) return a;
  return gcd(b,a%b);
}
ll lcm(ll a,ll b){
  return a*b/gcd(a,b);
}

int n;ll l,h,c[12],lc[2000],f[2000],g[2000];

void solve(){
  cin >> n >> l >> h;
  rep(i,n){
    cin >> c[i];
  }
  int U=(1 << n)-1;
  int s=0;
  ll ans=0;int m=0;
  rep(S,U+1){
    lc[S]=1;
  }
  f[0]=h-l+1;
  Rep(S,1,U+1){
    if(S==((1<<(m+1))))m+=1;
    //cout << m << endl;
    lc[S]=lcm(lc[S^(1<<m)],c[m]);
    if(lc[S]>h) lc[S]=h+1; 
    //cout << bitset<10>(S) << " " << lc[S] << endl;
    f[S]=h/lc[S]-(l-1)/lc[S];
    //cout << bitset<10>(S) << " " << f[S] << endl;
  }
  //cout << "a" << endl;
  per(S,U+1){
    g[S]=f[S];
    for (int T=S;T<=U;T=(T+1)|S) {
      if(S==T) continue;
      g[S]-=g[T];
    }
    //cout << bitset<10>(S) << " " << g[S] << endl;
  }
  
  rep(i,n){
    ans+=g[(1 << i)];
  }
  cout << ans << endl;
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout << fixed << setprecision(50);
    solve();
}