#include <iostream>
#include <stdio.h>
#include <cstring>
#include <math.h>
#include <algorithm>
#include <vector>
#define rep(i,n) for(int i=0;i<n;i++)
#define FOR(i,a,b) for(int i=a;i<b;i++)
#define ll long long
#define LL long long
#define mass 1000000007
using namespace std;

int main(){
	int n,l,h;
	cin>>n>>l>>h;
	int *c;
	c=new int[n];
	rep(i,n){
		cin>>c[i];
	}
	int count=0;
	FOR(i,l,h+1){
		int ch=0;
		rep(j,n){
			if(i%c[j]==0){
				if(ch==0){
					ch++;
				}
				else if(ch==1){
					ch++;
					break;
				}
			}
		}
		if(ch==1){
			count++;
		}
	}
	cout<<count<<endl;


	delete []c;



	
	return 0;
	

}