#include<bits/stdc++.h>
using namespace std;
int main(){
ios_base::sync_with_stdio(false);
cin.tie(0);
long long n,a,b;cin>>n>>a>>b;
vector<long long>arr(n);
for (long long i = 0;i<n;++i){
cin>>arr[i];
}
vector<long long>pref(n + 1,0);
for (int i = 0;i<n;++i){
pref[i + 1] = pref[i] + arr[i];
}
auto query = [&](int u,int v){
return pref[v + 1] - pref[u];
};
long long cur = 0;
auto check = [&](long long v){
vector<vector<int>>dp(n + 1);
dp[0].push_back(0);
for (int i = 0;i<n;++i){
for (int x = i;x<n;++x){
if (query(i,x) & v){
continue;
}
for (auto y:dp[i]){
if (y + 1 <= b)
dp[x + 1].push_back(y + 1);
}
}
}
for (auto x:dp[n]){
if (x >= a && x <= b)return 1;
}
return 0;
};
long long ans = 0;
for (long long i = 43;i>=0;--i){
if (check((cur ^ (1LL<<i)))){
cur ^= (1LL<<i);
}
else{
ans ^= (1LL<<i);
}
}
cout<<ans<<'\n';
return 0;
}
