#include<bits/stdc++.h>
#define int long long
using namespace std;
int n,l,r,c[1234567],ans;
signed main(){
	freopen("onlyone.in","r",stdin);
	freopen("onlyone.out","w",stdout);
	cin>>n>>l>>r;
	for(int i=1;i<=n;i++)scanf("%lld",&c[i]);
	for(int i=l;i<=r;i++){
		int cnt=0;
		for(int j=1;j<=n;j++){
			if(i%c[j]==0)cnt++;
			if(cnt>1)break;
		}
		if(cnt==1)ans++;
	}
	cout<<ans<<endl;
	return 0;
}