#include<iostream>
#include<vector>
#include<algorithm>
#include<cstring>
#include<cassert>
#include<cmath>
#include<ctime>
#include<iomanip>
#include<numeric>
#include<stack>
#include<queue>
#include<map>
#include<unordered_map>
#include<set>
#include<unordered_set>
#include<bitset>
#include<random>
#include<functional>
#include<utility>
using namespace std;
long long gcd(long long a,long long b)
{
	while(b)
	{
		a %= b;
		swap(a,b);
	}
	return a;
}
long long lcm(long long a,long long b){return a/gcd(a,b)*b;}
int N,L,H;
long long C[10];
void solve()
{
	cin >> N >> L >> H;
	for(int i = 0;i < N;i++) cin >> C[i];
	long long ans = 0;
	for(int i = 1;i < 1 << N;i++)
	{
		long long l = 1;
		for(int j = 0;j < N;j++) if(i >> j & 1) l = lcm(l,C[j]);
		int b = __builtin_popcount(i);
		long long cur = (H/l - (L+l-1)/l + 1)*b;
		if(b & 1) ans += cur;
		else ans -= cur;
	}
	cout << ans << endl;
}
int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	int tt = 1;
	//cin >> tt;
	while(tt--) solve();
}