#include <fstream>

using namespace std;
ifstream f("castel.in");
ofstream g("castel.out");

struct cell{
int l, c;
};

cell coada[23500];
int dl[4] = {0, -1, 0, 1};
int dc[4] = {-1, 0, 1, 0};
bool chei[23500], drum[152][152];
int castel[152][152];
int cntr, sol, n, m;
int i, j, lvec, cvec;

void citire()
{
    f >> n >> m
    for (i= 1 ; i <=n ; i++ )
        for(j=1; j<=m; j++)
        f >> castel[i][j];
}
void bordare()
{
    for(i=1; i<=n; i++)
{
        catel[0][i]=-1;
        catel[n+1][i]=-1;
        castel[i][0]=-1;
        castel[0][n+1]=-1;
}
}

void lee ()
{
    bool iesi = false;
    for (i = 0; i < cntr; i++) {
        for (j = 0; j < NR_DIR; j++) {
            lvec = coada[i].l + dl[j];
            cvec = coada[i].c + dc[j];
            if (castel[lvec][cvec] != -1 && chei[castel[lvec][cvec]] && drum[lvec][cvec] == 0) {
                drum[lvec][cvec] = 1;
                coada[cntr].l = lvec;
                coada[cntr++].c = cvec;
                sol++;
                chei[(lvec - 1) * m + cvec] = 1;
                iesi = 1;
            }
        }
    }
    if (iesi == 1)
    {
        lee();
    }
}
int main()
{
    citire();
    bordare();
    coada[cntr].l = ((pozS - 1) / m) + 1;
    coada[cntr].c = (pozS - 1) % m + 1;
    chei[castel[coada[cntr].l][coada[cntr].c]] = 1;
    cntr++;
    lee ();

    g << sol;
    return 0;
}