package Test;import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;public class Main {static int N = 110,hh = 0,tt = -1,n,m;static int[][] g = new int[N][N];   //用来存储迷宫static int[][] d = new int[N][N];   //用来存储d[i][j]到远点的距离static PII[] q = new PII[N * N];static int[] dx = {-1,0,1,0};static int[] dy = {0,1,0,-1};static BufferedReader in = new BufferedReader(new InputStreamReader(System.in));public static int bfs(){d[0][0] = 0;    //初始化头节点距离为0//bfs模板//先把头节点放入队列中q[++tt] = new PII(0,0);//扩展放入队列的点while (hh<=tt){PII t = q[hh++];    //把头节点拿出来,然后再把头节点周围满足条件的点放入for (int i = 0; i < 4; i++) {int x = t.first + dx[i];    //行int y = t.second + dy[i];   //列if (x >= 0 && y >= 0 && x < n && y < m && g[x][y] == 0 && d[x][y] == -1){d[x][y] = d[t.first][t.second] + 1;//把扩展的点加入队列q[++tt] = new PII(x,y);}}}//下标从0开始return d[n - 1][m - 1];}public static void main(String[] args) throws IOException {String[] init = in.readLine().split(" ");n = Integer.parseInt(init[0]);m = Integer.parseInt(init[1]);for (int i = 0; i < n; i++) {init = in.readLine().split(" ");for (int j = 0; j < m; j++) {g[i][j] = Integer.parseInt(init[j]);d[i][j] = -1;}}System.out.println(bfs());in.close();}
}
class  PII{int first;int second;public PII(int first, int second) {this.first = first;this.second = second;}
}