#include <bits/stdc++.h>
using namespace std;
#define fi first
#define se second
#define int long long
const int big=500;
signed main(){
ios_base::sync_with_stdio(false); cin.tie(NULL);
int r,c,a,b;
int gr[big+5][big+5];
int pref[big+5][big+5];
cin >> r >> c >> a >> b;
if(a>b) swap(a,b);
for(int i=1;i<=r;i++){
for(int j=1;j<=c;j++){
cin >> gr[i][j];
}
}
for(int i=1;i<=r;i++){
pref[i][0]=0;
for(int j=1;j<=c;j++){
pref[i][j]=pref[i][j-1]+gr[i][j];
}
}
int ans=LLONG_MAX;
//window
//compute row L R (L R from window)
//two pointer save min ans
auto cost = [a,b](int x){
return abs(x-a) + abs(x-b);
};
int row[big+5];
row[0]=0;
bool done=0;
for(int L=1;L<=c;L++){
for(int R=L;R<=c;R++){
for(int i=1;i<=r;i++){
row[i]=row[i-1]+pref[i][R]-pref[i][L-1];
}
int tp=1, bt=1;
while(tp<=r){
while(bt<=r && row[bt]-row[tp-1]<a) bt++;
if(bt>=tp){
int sum=row[bt]-row[tp-1];
if(a<=sum && sum<=b){
cout << b-a << '\n';
return 0;
}
if(bt-1>=tp){
int sum2=row[bt-1]-row[tp-1];
ans=min({ans,cost(sum), cost(sum2)});
} else ans=min(ans,cost(sum));
}
tp++;
if (tp > bt) bt = tp;
}
}
}
cout << ans << '\n';
}
