#include <cstdio>
#include <vector>
using namespace std;
#define lmax 22555

int n, m, k, v[lmax], ua[lmax], uc[lmax], c[lmax], h;
vector <int> d[lmax];

void add(int x)
{
	if (!ua[x] && !uc[x])
		{	
			if (uc[v[x]])			
			{
				h++;
				c[h]=x;
				uc[x]=1;
				
			} else
			{
				d[v[x]].push_back(x);
				ua[x]=1;
			}
		}
}

int main()
{
	freopen("castel.in","r",stdin);
	freopen("castel.out","w",stdout);
	scanf("%d %d %d",&n,&m,&k);
	int i, j, x, f;
	for (i=1; i<=n*m; i++) scanf("%d",&v[i]);
	h=1;
	c[1]=k;
	uc[k]=1;
	uc[v[k]]=1;
	for (i=1; i<=h; i++)
	{
		x=c[i];
		for (j=0; j<d[x].size(); j++)
			{
				f=d[x][j];
				h++;
				c[h]=f;
				uc[f]=1;
				ua[f]=0;
			}
		d[x].erase(d[x].begin(), d[x].end());
		x=c[i]-1;
		if (c[i]%m!=1) add(x);
		x=c[i]+1;
		if (c[i]%m) add(x);
		x=c[i]-m;
		if (x>0) add(x);
		x=c[i]+m;
		if (x<=n*m) add(x);
	}
	printf("%d",h);
}