#include <bits/stdc++.h>
using namespace std;
ifstream fin("schior.in");
ofstream fout("schior.out");
int di[8]={0,0,1,-1,1,1,-1,-1};
int dj[8]={1,-1,0,0,-1,1,-1,1};


bool ok(int i,int j,int n,int m)
{
    if (i<1||j<1||i>n||j>m) return false;
    return true;
}
int main()
{
    int n,m;
    fin>>n>>m;
    int l,o;
    fin>>o>>l;
    int v[n+1][m+1];
    int w[n+1][m+1];
    memset(w,0,sizeof w);
    for (int i=1;i<=n;++i)
        for (int j=1;j<=m;++j)
            fin>>v[i][j];
    queue<pair<int, int> > q;
    w[o][l]=1;
    int altmin=v[o][l];
    q.push(make_pair(o,l));
    while (!q.empty())
    {
        int i,j;
        i=q.front().first;
        j=q.front().second;
        q.pop();
        for(int d=0;d<8;++d)
        {
            int ii,jj;
            ii=i+di[d];
            jj=j+dj[d];
           if (ok(ii,jj,n,m)&&v[ii][jj]<=v[i][j]&&w[ii][jj]==0)
            {
                if (v[ii][jj]<altmin) altmin=v[ii][jj];

                w[ii][jj]=1;
                q.push(make_pair(ii,jj));
            }
        }
    }
    fout<<altmin;
}