#include<bits/stdc++.h>
using namespace std;

int i,j,k,it,N,M,K,L,a,b,c,d,v[40][40][40][40],rs=2e9+69;

int get_the_max(int x,int y,int z,int w) {
    int i,j,k,it,ans=-1e9-69;

    for(i=x-a+1;i<=x;++i)
     for(j=y-b+1;j<=y;++j)
      for(k=z-c+1;k<=z;++k)
       for(it=w-d+1;it<=w;++it)
       ans=max(ans,v[i][j][k][it]);

    return ans;
}

int main()
{
  scanf("%d%d%d%d",&N,&M,&K,&L);
  scanf("%d%d%d%d",&a,&b,&c,&d);

  for(i=1;i<=N;++i)
   for(j=1;j<=M;++j)
    for(k=1;k<=K;++k)
     for(it=1;it<=L;++it)
      scanf("%d",&v[i][j][k][it]);

  for(i=a;i<=N;++i)
   for(j=b;j<=M;++j)
    for(k=c;k<=K;++k)
     for(it=d;it<=L;++it)
     rs=min(rs,get_the_max(i,j,k,it));

  printf("%d\n",rs);

 return 0;
}