#include <iostream>
#include <fstream>
#include <queue>
using namespace std;

bool Map[1001][1001];
int n, m;
queue < pair < int,int > > coada;
void citire()
{
    ifstream f("traversare.in");
    f >> n >> m;
    for(int j = 1 ; j <= m; j++)
    {
         f  >> Map[1][j];
         if(Map[1][j] == 0) coada.push(make_pair(1,j)),Map[1][j] = 1;
    }
    for (int i = 2 ; i <= n ; i++)
        for(int j = 1;j <= m; j++)f >> Map[i][j];

       f.close();
}
bool ok(int i,int j)
{
 if ( i < 1  || j < 1 || i > n || j > m) return false;
 if (Map[i][j] != 0) return false;
 return true;
}
void lee()
{    int di[] = { 1, 0, 0};
     int dj[] = { 0 , -1, 1};
    int i, j, i_urm, j_urm;
    while(!coada.empty())
    {
        i = coada.front().first;
        j = coada.front().second;
        coada.pop();
        for ( int  dir = 0; dir <= 2; dir++)
        {
            i_urm =  i + di[dir];
            j_urm =  j + dj[dir];
            if(ok(i_urm,j_urm))
            {
                coada.push(make_pair(i_urm,j_urm));
                Map[i_urm][j_urm] = Map[i][j] + 1;
            }
        }
    }


}
int main()
{
    int minim = 20000;
    for (int i = 1 ; i <= m ;i++)
        if(Map[n][i] < minim) minim = Map[n][i];
    ofstream g("traversare.out");
    g << minim;
    g.close();
    return 0;
}