#include<iostream>
#include<algorithm>
#include<bitset>
#include<vector>
#define ll long long
#define pb push_back
using namespace std;
long long int n,a,b,y[21];
long long int inf = (long long)1e17+17;
long long int ans=inf;
void do_job(int pos,int sep,ll sum, ll ret)
{
if(pos==n){
if(a<=sep && sep<=b)ans=min(ans,sum|ret);
return;
}
do_job(pos+1,sep,sum+y[pos],ret);
do_job(pos+1,sep+1,y[pos],sum|ret);
}
int main()
{
ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
cin>>n>>a>>b;
for(int i=0;i<n;i++)cin>>y[i];
do_job(1,1,y[0],0);
cout<<ans<<endl;
}
