#include<bits/stdc++.h>
#define int long long
using namespace std;
int ar[2005];
int32_t main(){
ios_base::sync_with_stdio(false);
cin.tie(0);
int n,a,b;cin>>n>>a>>b;
for(int i=1;i<=n;i++)cin>>ar[i];
if(a==1){
int val=0;
for(int i=40;i>=0;i--){
int nval=val;
int sum=0;
int cnt=0;
int cur=1;
int nxt=1;
int cant=0;
//cerr<<val<<":\n";
while(cur<=n){
//cerr<<cur<<" ";
sum=0;
for(int j=cur;j<=n;j++){
sum+=ar[j];
if((sum&(~nval))<(1LL<<i))nxt=j+1;
}
//cerr<<nxt-1<<" "<<sum<<"\n";
if(nxt<=cur){
cant=1;
break;
}
cur=nxt;
cnt++;
}
if(cant||cnt>b){
val=val|(1LL<<i);
}
}
cout<<val;
}else{
cout<<"^_^\n";
}
}
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