#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main() {
ios::sync_with_stdio(0); cin.tie(0);
int n, m, a, b; cin >> n >> m >> a >> b;
vector<vector<int>> g(n+1, vector<int> (m+1, 0)), ps(n+1, vector<int> (m+1, 0));
for (int i=1; i<=n; ++i) {
for (int j=1; j<=m; ++j) {
cin >> g[i][j];
ps[i][j] = g[i][j];
ps[i][j] += ps[i-1][j];
}
}
if (b < a) swap(a, b);
int ans = 1e18;
for (int i=1; i<=n; ++i) {
for (int j=i; j<=m; ++j) {
int l = 1, sum = 0;
for (int r = 1; r <= m; ++r) {
sum += ps[j][r] - ps[i-1][r];
while (l <= r && sum > b) {
sum -= ps[j][l] - ps[i-1][l];
l++;
}
ans = min(ans, abs(a - sum) + abs(b - sum));
}
}
}
cout << ans;
}
