#include <bits/stdc++.h>
using namespace std;
#define fi first
#define sec second
#define int long long
#define medal ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
#define endl '\n'
const int maxn = 510;
int pref[maxn][maxn];
signed main(){
medal
int r,s,a,b;
cin>>r>>s>>a>>b;
int big = max(a,b);
int small = min(a,b);
for(int i=1; i<=r; i++){
for(int j=1; j<=s; j++){
cin>>pref[i][j];
pref[i][j] += (pref[i-1][j]+pref[i][j-1]-pref[i-1][j-1]);
}
}
int ans = 1e18;
// cout<<"sampai";
for(int i=1; i<=r; i++){
for(int j=i; j<=r; j++){
// cout<<i<<" "<<j<<endl;
int col[s+1];
col[0] = 0;
for(int k=1; k<=s; k++){
col[k] = col[k-1]+ pref[j][k] - pref[j][k-1] - pref[i-1][k] + pref[i-1][k-1];
}
int l = 1, r = 1;
while(r<=s){
int sum = col[r]-col[l-1];
ans = min(ans, abs(sum-big)+abs(sum-small));
while(l<=r && sum>big){
l++;
sum = col[r] - col[l-1];
ans = min(ans, abs(sum-big) + abs(sum-small));
}
r++;
}
}
}
cout<<ans;
}
