#include<bits/stdc++.h>
using namespace std;

#define DEBUG(x) cout<<#x<<": "<<x<<endl;
#define DEBUG_VEC(v) cout<<#v<<":";for(int i=0;i<v.size();i++) cout<<" "<<v[i]; cout<<endl

typedef long long ll;
#define vi vector<int>
#define vl vector<ll>
#define vii vector< vector<int> >
#define vll vector< vector<ll> >
#define vs vector<string>
#define pii pair<int,int>
#define pis pair<int,string>
#define psi pair<string,int>
const int inf = 1000000001;
const ll INF = 1e16;
#define MOD 1000000007
#define mod 1000000009
#define pi 3.14159265358979323846
#define Sp(p) cout<<setprecision(15)<<fixed<<p<<endl;
int dx[4] = { 1,0,-1,0 }, dy[4] = { 0,1,0,-1 };


int main() {
	int n, l, h, i, j;
	cin >> n >> l >> h;
	vi c(10,0);
	for (i = 0; i < n; i++) {
		cin >> c[i];
	}
	vector<bool> b(n);
	ll sum = 0;
	for (i = 1; i <= 1024 ; i++) {
		int s = i;
		for (j = 0; j < 10; j++) {
			if (s & 512) {
				b[j] = 1;
			}
			else {
				b[j] = 0;
			}
			s = s << 1;
		}
		int cnt = 0, seki = 1;
		for (j = 0; j < 10; j++) {
			if (b[j]) {
				cnt++;
				seki *= c[j];
			}
		}
		if (seki) {
			sum += pow((-1),((cnt % 2) + 1))*((h / seki) - ((l - 1) / seki))*cnt;
		}
	}
	cout << sum << endl;
	return 0;
}