#include<bits/stdc++.h>
using namespace std;
const long long inf = (long long) 1e18 + 10;
const int inf1 = (int) 1e9 + 10;
#define int long long
#define dbl long double
#define endl '\n'
#define sc second
#define fr first
#define mp make_pair
#define pb push_back
#define all(x) x.begin(), x.end()
const int maxn = 2e3+10;
int n,a,b,y[maxn], pf[maxn];
int sol(int val) {
vector<int> dp(n+1,inf);
dp[0] = 0;
for(int i = 1; i <= n; i++) {
for(int j = 1; j <= i; j++) {
if(((pf[i]-pf[j-1])&val) == 0) {
dp[i] = min(dp[i],dp[j-1]+1);
}
}
}
return dp[n];
}
void solve() {
cin >> n >> a >> b;
for(int i = 1; i <= n; i++) {
cin >> y[i];
pf[i] = pf[i-1]+y[i];
}
int ans = 0;
for(int p = 60; p >= 0; p--) {
if(sol(ans+(1LL<<p)) <= b) {
ans+= (1LL<<p);
}
}
cout << (1LL<<61)-1-ans << endl;
}
int32_t main() {
ios::sync_with_stdio(false); cin.tie(0);
// freopen("in.in", "r", stdin);
// freopen("out.out", "w", stdout);
int tt = 1;
// cin >> tt;
while(tt--) {
solve();
}
}
