#include <bits/stdc++.h>
//#include "includeall.h"
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
#define endl '\n'
#define f first
#define s second
#define pb push_back
#define mp make_pair
#define lb lower_bound
#define ub upper_bound
#define input(x) scanf("%lld", &x);
#define input2(x, y) scanf("%lld%lld", &x, &y);
#define input3(x, y, z) scanf("%lld%lld%lld", &x, &y, &z);
#define input4(x, y, z, a) scanf("%lld%lld%lld%lld", &x, &y, &z, &a);
#define print(x, y) printf("%lld%c", x, y);
#define show(x) cerr << #x << " is " << x << endl;
#define show2(x,y) cerr << #x << " is " << x << " " << #y << " is " << y << endl;
#define show3(x,y,z) cerr << #x << " is " << x << " " << #y << " is " << y << " " << #z << " is " << z << endl;
#define all(x) x.begin(), x.end()
#define discretize(x) sort(x.begin(), x.end()); x.erase(unique(x.begin(), x.end()), x.end());
#define FOR(i, x, n) for (ll i =x; i<=n; ++i)
#define RFOR(i, x, n) for (ll i =x; i>=n; --i)
#pragma GCC optimize("O3","unroll-loops")
//#pragma GCC target("popcnt")
using namespace std;
mt19937_64 rnd(chrono::steady_clock::now().time_since_epoch().count());
//using namespace __gnu_pbds;
//#define ordered_set tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update>
//#define ordered_multiset tree<int, null_type, less_equal<int>, rb_tree_tag, tree_order_statistics_node_update>
typedef long long ll;
typedef long double ld;
typedef pair<ld, ll> pd;
typedef pair<string, ll> psl;
typedef pair<ll, ll> pi;
typedef pair<pi, ll> pii;
typedef pair<pi, pi> piii;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
ll dp[505][505];
inline ll cal(ll x1, ll y1, ll x2, ll y2)
{
return dp[x2][y2] - dp[x1-1][y2] - dp[x2][y1-1] + dp[x1-1][y1-1];
}
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
cout.tie(nullptr);
ll r, c, a, b;
cin >> r >> c >> a >> b;
for (ll i=1; i<=r; ++i) for (ll j=1; j<=c; ++j)
{
cin >> dp[i][j];
dp[i][j] += dp[i-1][j] + dp[i][j-1] - dp[i-1][j-1];
}
ll ans = LLONG_MAX;
for (ll i=1; i<=r; ++i) for (ll j=1; j<=c; ++j)
{
ll idx1 = i, idx2 = 1;
while (idx1 > 1 && cal(idx1, j, i, j) < a) idx1--;
for (ll k=j; k>=1; --k)
{
while (idx1 + 1 <= i && cal(idx1 + 1, k, i, j) >= a) idx1++;
ll v = cal(idx1, k, i, j);
ans = min(ans, abs(v-a) + abs(v-b));
while (idx2 > 1 && cal(idx2, k, i, j) > b) idx2++;
v = cal(idx2, k, i, j);
ans = min(ans, abs(v-a) + abs(v-b));
}
}
cout << ans << endl;
return 0;
}
