#include<bits/stdc++.h>
using namespace std;
#define int long long
#define nl '\n'
vector<int> dp[101][101];
inline void solve(){
int n, a, b;
cin>>n>>a>>b;
int c[n+1], sum = 0;
for(int i=1; i<=n; i++){
cin>>c[i];
sum += c[i];
dp[i][1].push_back(sum);
}
for(int k=2; k<=b; k++){
for(int i=1; i<=n; i++){
int sm = 0;
for(int j=i; j>0; j--){
sm += c[j];
for(int x : dp[j-1][k-1]){
dp[i][k].push_back(sm | x);
}
}
}
}
int ans = 1e18;
for(int i=a; i<=b; i++) ans = min(ans, *min_element(dp[n][i].begin(), dp[n][i].end()));
cout<<ans;
}
signed main(){
ios_base::sync_with_stdio(0);
cin.tie(NULL);cout.tie(NULL);
int t = 1;
//cin>>t;
while(t--) solve();
return 0;
}
