#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;
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;
for(int i=1; i<=r; i++){
for(int j=1; j<=s; j++){
for(int ii=i; ii<=r; ii++){
for(int jj=j; jj<=s; jj++){
int sum = pref[ii][jj]-pref[i-1][jj]-pref[ii][j-1]+pref[i-1][j-1];
ans = min(ans, abs(sum-a)+abs(sum-b));
}
}
}
}
cout<<ans;
}
