#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<ll,ll>
#define fi first
#define se second
#define made '\n'
const ll N=505,MOD=1e9+7,INF=1e18;
ll pref[N][N],a[N][N];
ll f(int x,int y,int xx,int yy){
ll cnt=pref[xx][yy];
cnt-=pref[x-1][yy];
cnt-=pref[xx][y-1];
cnt+=pref[x-1][y-1];
return cnt;
}
int main(){
ios::sync_with_stdio(false);
cin.tie(nullptr);
ll n,m,x,y;cin>>n>>m>>x>>y;
if(x>y)swap(x,y);
for(int i=1; i<=n; i++){
for(int j=1; j<=m; j++){
cin>>a[i][j];
pref[i][j]=pref[i][j-1]+a[i][j]+pref[i-1][j]-pref[i-1][j-1];
}
}
ll mn=INF;
for(int i=1; i<=n; i++){
for(int k=i; k<=n; k++){
for(int j=1,l=1; j<=m; j++){
ll cnt=f(i,l,k,j);
mn=min(mn,abs(x-cnt)+abs(y-cnt));
while(cnt>y){
l++;
cnt=f(i,l,k,j);
mn=min(mn,abs(x-cnt)+abs(y-cnt));
}
}
}
}
cout<<mn;
}
