#include "bits/stdc++.h"
using namespace std;
#define ll long long
#define endl '\n'
#define rep(i, n) for(int i = 0; i < (int)(n); i++)
#define rep2(i,a,b) for(int i=int(a);i<int(b);i++)
#define pb emplace_back
#define all(x) (x).begin(),(x).end()
int mod=1e9+7;
int mod2=998244353;
const int INF=1e9;
//g++ -std=c++11 a.cpp

signed main(){
	ll n,l,r;
	while(1){
		cin>>n>>l>>r;
		if(n==0&&l==0&&r==0)break;
		vector<ll> a(n);
		rep(i,n)cin>>a[i];
		ll ans=0;
		//sort(all(a),greater<ll>());
		rep2(i,l,r+1){
			rep(j,n){
				if(j%2==0&&i%a[j]==0){
					ans++;
					break;
				}
				if(j%2==1&&i%a[j]==0){
					break;
				}
				if(j==n-1){
					if(n%2==0)ans++;
					break;
				}
			}
		}
		cout<<ans<<endl;
	}
}

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