#include<bits/stdc++.h>
#define int long long
using namespace std;
int n,l,r,c[12];
int gcd(int a,int b){return b?gcd(b,a%b):a;}
int lcm(int a,int b){return a*b/gcd(a,b);}
int query(int x)
{
	int res=0;
	if(!x)return 0;
	for(int i=1,s,t,ct;i<(1<<n);i++)
	{
		s=-1;t=1;ct=0;
		for(int j=0;j<n;j++)if(i&(1<<j))
		{
			s*=-1;ct++;t=lcm(t,c[j]);
			if(t>x){s=0;break;}
		}
		res+=x/t*s*ct;
	}
	return res;
}
signed main()
{
	cin>>n>>l>>r;
	for(int i=0;i<n;i++)cin>>c[i];
	cout<<query(r)-query(l-1);
}