castel3

#include <cstdio>
#include <vector>

using namespace std;

#define MAX_N 180
#define FIN "castel.in"
#define FOUT "castel.out"

const int di[] = {-1,+1, 0, 0};
const int dj[] = { 0, 0,-1,+1};

int N, M, K, A[MAX_N][MAX_N], Q[MAX_N*MAX_N], Res;
char U[MAX_N][MAX_N], key[MAX_N*MAX_N];
vector<int> key_list[MAX_N*MAX_N];

int main(void)
{
    int n, i, j, d, ii, jj, ql, qr;
    vector<int>::iterator it;

    freopen(FIN, "r", stdin);
    freopen(FOUT, "w", stdout);

    scanf("%d %d %d", &N, &M, &K);
    for (i = 0; i < N; i++)
        for (j = 0; j < M; j++)
        {
            scanf("%d", A[i]+j);
            A[i][j]--;
        }

    Q[ql = qr = 0] = --K;
    U[K/M][K%M] = 1;
    for (; ql <= qr; ql++)
    {
        // am cheia N
        key[n = Q[ql]] = 1; Res++;
        for (it = key_list[n].begin(); it != key_list[n].end(); it++)
            if (!U[*it/M][*it%M])
            {
                Q[++qr] = *it;
                U[*it/M][*it%M] = 1;
            }
        i = n/M; j = n%M;
        for (d = 0; d < 4; d++)
        {
            ii = i+di[d], jj = j+dj[d];
            if (ii < 0 || jj < 0 || ii >= N || jj >= M || U[ii][jj]) continue;
            if (key[A[ii][jj]])
            {
                Q[++qr] = ii*M+jj;
                U[ii][jj] = 1;
            }
            else key_list[A[ii][jj]].push_back(ii*M+jj);
        }
    }

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

    return 0;
}