#include <bits/stdc++.h>
#define ll long long
#define pb push_back
#define fi first
#define se second
#define akeh int tc = 1; cin >> tc; while(tc--){solve();}
#define vector2d(x) vector<vector<x>>
#define pii pair<int, int>
#define pl pair<ll, ll>
#define kagamine_len ios_base::sync_with_stdio(0); cin.tie(0);
#define file_in freopen("input.txt", "r", stdin);
#define file_out freopen("output.txt", "w", stdout);
#define all(x) x.begin(), x.end()
using namespace std;
int main(){
kagamine_len
// file_in file_out
ll r, s, a, b;
cin >> r >> s >> a >> b;
vector2d(ll) ar(r+1, vector<ll>(s+1));
vector2d(ll) pf(r+1, vector<ll>(s+1, 0));
for (ll i = 1; i <= r; i++){
for (ll j = 1; j <= s; j++){
cin >> ar[i][j];
pf[i][j] = ar[i][j];
pf[i][j] += pf[i-1][j] + pf[i][j-1] - pf[i-1][j-1];
}
}
ll ans = LLONG_MAX;
for (ll i = 1; i <= r; i++){
for (ll j = 1; j <= s; j++){
for (ll k = i; k <= r; k++){
for (ll m = j; m <= s; m++){
ll hg = pf[k][m]-pf[i-1][j]-pf[i][j-1]+pf[i-1][j-1];
ans = min(ans, abs(hg-a)+abs(hg-b));
}
}
}
}
cout << ans;
return 0;
}
