#include <bits/stdc++.h>
using namespace std;
int main(){
long long r,s,a,b;
cin>>r>>s>>a>>b;
long long grid[r+1][s+1];
for (long long i = 1; i <=r; i++)
{
for (long long j = 1; j <=s; j++)
{
cin>>grid[i][j];
}
}
vector<vector<long long>> ps(r+1,vector<long long>(s+1,0));
long long ans=LONG_LONG_MAX;
for (long long i = 1; i <=r; i++)
{
for (long long j = 1; j <=s; j++)
{
ps[i][j]+=ps[i-1][j]+ps[i][j-1]-ps[i-1][j-1]+grid[i][j];
}
}
for (long long i = 1; i <=r; i++)
{
for (long long j = 1; j <=s; j++)
{
for (long long k = 1; k <=i; k++)
{
for (long long l = 1; l <= j; l++)
{
long long nilai=ps[i][j]-ps[k][l-1]-ps[k-1][l]+ps[k-1][l-1];
ans=min(ans,abs(nilai-a)+abs(nilai-b));
}
}
}
}
cout<<ans<<endl;
}
