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#include <cstdlib>
#include <iostream>
#include <fstream>
#include <queue>
#include <vector>
#include <functional>
using namespace std;
#define POINT(x, y) (((x) << 7) + (y))
#define ENC(s, x, y) (((s) << 14) + ((x) << 7) + (y))
void
explore(short x, short y, short n, short a[102][102], short* p[102][102])
{
short i, j;
short* area = p[x][y];
queue<short> q;
q.push(POINT(x, y));
while (!q.empty())
{
i = q.front();
q.pop();
j = i & 127;
i >>= 7;
if (i > 1 && a[i - 1][j] && !p[i - 1][j])
{
(*area)++;
p[i - 1][j] = area;
q.push(POINT(i - 1, j));
}
if (i < n && a[i + 1][j] && !p[i + 1][j])
{
(*area)++;
p[i + 1][j] = area;
q.push(POINT(i + 1, j));
}
if (j > 1 && a[i][j - 1] && !p[i][j - 1])
{
(*area)++;
p[i][j - 1] = area;
q.push(POINT(i, j - 1));
}
if (j < n && a[i][j + 1] && !p[i][j + 1])
{
(*area)++;
p[i][j + 1] = area;
q.push(POINT(i, j + 1));
}
}
}
int
main()
{
short n, x, y, i, j, a[102][102] = {};
ifstream infile;
infile.open("VDD.INP");
infile >> n >> x >> y;
for (i = 1; i <= n; i++)
for (j = 1; j <= n; j++)
infile >> a[i][j];
infile.close();
short* p[102][102] = {};
for (i = 1; i <= n; i++)
for (j = 1; j <= n; j++)
if (a[i][j] && !p[i][j])
{
p[i][j] = (short*) malloc(sizeof(short));
*p[i][j] = 1;
explore(i, j, n, a, p);
}
priority_queue<long, vector<long>, greater<long>> heap;
bool visited[102][102] = {};
queue<short> q;
visited[x][y] = true;
q.push(POINT(x, y));
while (!q.empty())
{
i = q.front();
q.pop();
j = i & 127;
i >>= 7;
if (!(a[i + 1][j] && a[i][j + 1] && a[i - 1][j] && a[i][j - 1]))
heap.push(POINT(i, j));
if (i > 1 && !visited[i - 1][j] && a[i - 1][j])
{
q.push(POINT(i - 1, j));
visited[i - 1][j] = true;
}
if (i < n && !visited[i + 1][j] && a[i + 1][j])
{
q.push(POINT(i + 1, j));
visited[i + 1][j] = true;
}
if (j > 1 && !visited[i][j - 1] && a[i][j - 1])
{
q.push(POINT(i, j - 1));
visited[i][j - 1] = true;
}
if (j < n && !visited[i][j + 1] && a[i][j + 1])
{
q.push(POINT(i, j + 1));
visited[i][j + 1] = true;
}
}
short* current = p[x][y], s = 12345;
long tmp;
while (!heap.empty())
{
tmp = heap.top();
heap.pop();
i = tmp >> 7 & 127;
j = tmp & 127;
tmp >>= 14;
if (tmp > s)
break;
if (p[i][j] && p[i][j] != current)
if (*p[i][j] <= *current)
continue;
else
{
s = tmp;
*current = *p[i][j];
}
tmp++;
if (i && !visited[i - 1][j])
{
heap.push(ENC(tmp, i - 1, j));
visited[i - 1][j] = true;
}
if (i < n + 1 && !visited[i + 1][j])
{
heap.push(ENC(tmp, i + 1, j));
visited[i + 1][j] = true;
}
if (j && !visited[i][j - 1])
{
heap.push(ENC(tmp, i, j - 1));
visited[i][j - 1] = true;
}
if (j < n + 1 && !visited[i][j + 1])
{
heap.push(ENC(tmp, i, j + 1));
visited[i][j + 1] = true;
}
}
ofstream outfile;
outfile.open("VDD.OUT");
outfile << (s == 12345 ? 0 : s - 1) << endl;
outfile.close();
return 0;
}
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