This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define ll long long
#define N 2005
using namespace std;
bool dp[N][N];
int dp2[N];
int n,A,B;
ll ans,arr[N],sum=0;
void init()
{
cin >> n >> A >> B;
for(int i=1;i<=n;++i){
cin >> arr[i];
sum+=arr[i];
}
}
void solve()
{
int maxn=log2(sum)+1;
for(int i=maxn;i>=0;--i){
ll res=( ans|( ((ll)1<<i)-(ll)1 ) );
memset(dp,0,sizeof(dp));
dp[0][0]=true;
for(int j=1;j<=n;++j){ //第J個數
for(int k=1;k<=min(j,B);++k){ //分段數
ll SUM=0;
for(int t=j-1;t>=k-1;--t){ //分割點
SUM+=arr[t+1];
if(dp[t][k-1] && ((SUM|res)==res) ){
dp[j][k]=true;
break;
}
}
}
}
bool flag=false;
for(int j=A;j<=B;++j){
if(dp[n][j]){
flag=true;
break;
}
}
if(!flag)
ans|=((ll)1<<i);
}
}
void solve2()
{
int maxn=log2(sum)+1;
for(int i=maxn;i>=0;--i){
ll res=( ans|( ((ll)1<<i)-(ll)1 ) );
memset(dp2,0x7f,sizeof(dp2));
dp2[0]=0;
for(int j=1;j<=n;++j){
ll SUM=0;
for(int k=j-1;k>=0;--k){
SUM+=arr[k+1];
if((SUM|res)==res)
dp2[j]=min(dp2[j],dp2[k]+1);
}
}
if(dp2[n]>B)
ans|=((ll)1<<i);
}
}
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(nullptr); cout.tie(nullptr);
init();
// if(A==1)
// solve2();
// else
solve();
cout << ans << endl;
return 0;
}
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