#include <bits/stdc++.h>
using namespace std;
typedef int64_t llo;
#define mp make_pair
#define pb push_back
#define a first
#define b second
#include "quality.h"
int n,m,aa,bb;
int it[3001][3001];
int pre[3001][3001];
int calc(int ac,int bc){
return pre[ac][bc]-pre[ac][bc-bb]-pre[ac-aa][bc]+pre[ac-aa][bc-bb];
}
int check(int mid){
for(int i=1;i<n+1;i++){
for(int j=1;j<m+1;j++){
if(it[i-1][j-1]<mid){
pre[i][j]=-1;
}
else if(it[i-1][j-1]==mid){
pre[i][j]=0;
}
else{
pre[i][j]=1;
}
}
}
for(int i=1;i<n+1;i++){
for(int j=1;j<m+1;j++){
pre[i][j]=pre[i-1][j]+pre[i][j]+pre[i][j-1]-pre[i-1][j-1];
}
}
int ma=1;
for(int i=aa;i<n+1;i++){
for(int j=bb;j<m+1;j++){
ma=min(ma,calc(i,j));
}
}
return ma;
}
int rectangle(int nn,int mm,int aaa,int bbb,int tt[3001][3001]){
n=nn;
m=mm;
aa=aaa;
bb=bbb;
for(int i=0;i<n;i++){
for(int j=0;j<m;j++){
it[i][j]=tt[i][j];
}
}
int low=1;
int high=n*m;
while(low<high-1){
int mid=(low+high)/2;
if(check(mid)<=0){
high=mid;
}
else{
low=mid;
}
}
int ans=high;
if(check(low)<=0){
ans=min(ans,low);
}
return ans;
// cout<<ans<<endl;
}
/*int main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cin>>n>>m>>aa>>bb;
return 0;
}*/
