#include <bits/stdc++.h>
#define FOR(i,bg,ed) for(ll i=(bg);i<(ed);i++)
#define REP(i,n) FOR(i,0,n)
#define MOD 1000000007
//#define int long long
using namespace std;
typedef long long ll;
typedef vector<vector<ll>> mat;
const int INF = 1e9;



signed main()
{
    int N, L, H;
    int C[15];

    cin >> N >> L >> H;
    REP(i,N) cin >> C[i];

    int ans = 0;
    for (int i=L; i<=H; i++) {
        int cnt = 0;
        REP(j,N) if (i % C[j] == 0) cnt++;
        if (cnt == 1) ans++;
    }

    cout << ans << endl;
}