#include <bits/stdc++.h>
using namespace std;
template <typename T, typename U>
std::pair<T, U> operator+(const std::pair<T, U>& l, const std::pair<T, U>& r) {
  return {l.first + r.first, l.second + r.second};
}
typedef void (*callback_function)(void);
const long long INF64 = 1e18;
const long long INF32 = 1e9;
const long long MOD = 1e9 + 7;
const long double PI = acos(-1.0L);
const long double EPS = static_cast<long double>(1e-9);
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie();
  {
    long long n, m;
    cin >> n >> m;
    long long g[n][m];
    for (long long i = (0); i < (n); i++)
      for (long long j = (0); j < (m); j++) cin >> g[i][j];
    for (long long i = (0); i < (n); i++) {
      for (long long j = (0); j < (m); j++) cerr << g[i][j] << ' ';
      cerr << endl;
    }
    long long a, b;
    cin >> a >> b;
    long long res = n * m, cur;
    for (long long k = (0); k < (2); k++) {
      for (long long i = (0); i <= (n - a); i++)
        for (long long j = (0); j <= (m - b); j++) {
          cur = 0;
          for (long long x = (i); x < (i + a); x++)
            for (long long y = (j); y < (j + b); y++) cur += g[x][y];
          res = min(res, cur);
        }
      swap(a, b);
    }
    cout << res << endl;
  }
  return 0;
}
