import java.io.BufferedReader;
import java.io.IOException;
import java.util.ArrayDeque;
import java.util.HashMap;
import java.util.Map;
import java.util.Queue;
import java.util.Scanner;

public class Main
{
	public static final int countMax = 30;


	public static BufferedReader br;// = new BufferedReader(new InputStreamReader(System.in));

	public static void main(String[] args) throws NumberFormatException, IOException
	{
		// TODO 自動生成されたメソッド・スタブ

		int[][] go = {{0, -1}, {-1, 0}, {1, 0}, {0, 1}};

		Scanner sc = new Scanner(System.in);
		while(true)
		{
			int x = sc.nextInt();
			int y = sc.nextInt();
			if(x == 0 && y == 0) break;

			byte[][] maps = new byte[x][y];
			for(int i = 0; i < x; i++)
			{
				maps[i][0] = 0b0001;
				maps[i][y-1] = 0b1000;
				for(int j = 1; j < y-1; j++)
				{
					maps[i][j] = 0b0000;
				}
			}
			for(int i = 0; i < y; i++)
			{
				maps[0][i] += 0b0010;
				maps[x-1][i] += 0b0100;
			}
			//maps[0][0] = 0b0010;
			//maps[x-1][y-1] = 0b0100;

			for(int i = 0; i < y * 2 - 1; i++)
			{
				//System.err.println(i + " " + (i & 0x01) + " " + i / 2);
				if((i & 0x01) == 0x00)
				{
					for(int j = 0; j < x - 1; j++)
					{
						int temp = sc.nextInt();
						maps[j][i/2] += (byte) (temp << 2);
						maps[j + 1][i/2] += (byte) (temp << 1);
					}
				}
				else
				{
					for(int j = 0; j < x; j++)
					{
						int temp = sc.nextInt();
						maps[j][i/2] += (byte) (temp << 3);
						maps[j][i/2+1] += (byte) (temp << 0);
					}
				}
			}

			Queue<Integer> que = new ArrayDeque<>();
			Map<Integer, Integer> map = new HashMap<>();
			que.add(Ret(0, 0));
			map.put(Ret(0, 0), 1);

			while(!que.isEmpty())
			{
				int a = que.poll();
				int Tx = a / 1000;
				int Ty = a % 1000;
				for(int i = 0; i < 4; i++)
				{
					//System.err.println(Integer.toBinaryString(maps[Tx][Ty]) + " " + Tx + " " + Ty);
					if(((maps[Tx][Ty] >>> i) & 0x01) == 0x00)
					{
						int Txx = Tx + go[i][0];
						int Tyy = Ty + go[i][1];
						try
						{
							int temp = map.get(Ret(Txx, Tyy));
						}
						catch(Exception e)
						{
							que.add(Ret(Txx, Tyy));
							map.put(Ret(Txx, Tyy), map.get(a) + 1);
						}
					}
				}
			}

			try
			{
				int temp = map.get(Ret(x - 1, y - 1));
				System.out.println(temp);
			}
			catch(Exception e)
			{
				System.out.println("0");
			}
		}
	}

	public static int Ret(int x, int y)
	{
		return x * 1000 + y;
	}

	public static int KAKO(char[] a, int checking, int to)
	{
		int result = 0;
		for(int i = to; i < a.length; i++)
		{
			//System.err.print(a[i]);
			if(a[i] == '[') i = KAKO(a, 1, i + 1);
			else if(a[i] == '(') i = KAKO(a, 2, i + 1);
			else
			{
				switch(checking)
				{
					case 1:
					{
						if(a[i] == ']') return i;
						else if(a[i] == ')') return -100;
					}
					case 2:
					{
						if(a[i] == ']') return -100;
						else if(a[i] == ')') return i;
					}
					case 0:
					{
						if(a[i] == ']') return -100;
						else if(a[i] == ')') return -100;
					}
				}
			}
			if(i < 0) return -100;
		}
		if(checking == 0) return result;
		else return -100;
	}

	public static void addUnionFind(int a[][], int b, int c, boolean d[][])
	{
		//System.err.println("UnionFind" + " " + b%a.length + " " + b/a.length + " " + c%a.length + " " + c/a.length);
		int e = b;
		while(true)
		{
			boolean tempb = d[e%a.length][e/a.length];
			if(tempb) break;
			e = a[e%a.length][e/a.length];
		}
		//System.err.println("EDEFINED");
		int f = c;
		while(true)
		{
			boolean tempb = d[f%a.length][f/a.length];
			//System.err.println("F: " + f + " " + tempb);
			if(tempb) break;
			f = a[f%a.length][f/a.length];
		}
		//System.err.println("FDEFINED");
		//System.err.println("e:" + e + " f:" + f + " b:" + b + " c:" + c + " " + a[b%a.length][b/a.length] + " " + a[c%a.length][c/a.length]);
		d[c%a.length][c/a.length] = false;
		a[c%a.length][c/a.length] = b;
		//System.err.println("e:" + e + " f:" + f + " b:" + b + " c:" + c + " " + a[b%a.length][b/a.length] + " " + a[c%a.length][c/a.length]);
		if(e == f) return;
		else if(e > f)
		{
			d[e%a.length][e/a.length] = false;
			a[e%a.length][e/a.length] = f;
		}
		else
		{
			d[f%a.length][f/a.length] = false;
			a[f%a.length][f/a.length] = e;
		}
	}

	public static boolean checkWin(char[][] str, int num, int select, int select2, boolean[] b)
	{
		boolean b2 = false;
		//if(num % 3 == 2) System.err.print("| " + str[0][select] + " " + str[0][select2] + " ");
		if(num % 3 == 0)
		{
			for(int i = 0; i < 9; i++)
			{
				if(b2) return true;
				//if(num == 0) System.out.println(i);
				if(b[i]) continue;
				b[i] = true;
				b2 = checkWin(str, num + 1, i, 0, b);
				b[i] = false;
			}
		}
		else if(num % 3 == 1)
		{
			for(int i = 0; i < 9; i++)
			{
				//System.err.println(b[i] + " " + i);
				if(b[i]) continue;
				for(int j = -1; j < 2; j++)
				{
					if(b2) return true;
					if(str[0][select] == str[0][i] + j && str[1][select] == str[1][i])
					{
						//System.err.println(str[0][select] + " " + str[0][i] + " " + select + " " + i);
						b[i] = true;
						b2 = checkWin(str, num + 1, select, i, b);
						b[i] = false;
					}
				}
			}
		}
		else if(num % 3 == 2)
		{
			for(int i = 0; i < 9; i++)
			{
				if(b[i]) continue;
				for(int j = -1; j < 2; j++)
				{
					if(b2) return true;
					//System.err.println(str[0][select] + " " + str[0][select2] + " " + str[0][i] + " " + j + " " + i + " " + num);
					if(num == 8)
					{

						if(str[1][select] == str[1][i] && str[1][select2] == str[1][i])
						{
							if(j == 0)
							{
								if(str[0][select] == str[0][i] && str[0][select2] == str[0][i]) return true;
							}
							else
							{
								//System.err.println((str[0][select] == str[0][i] + j) + " " + (str[0][select2] != str[0][i] && str[0][select] != str[0][select2]));
								//System.err.println((str[0][select2] == str[0][i] + j) + " " + (str[0][select] != str[0][i] && str[0][select] != str[0][select2]));
								if(str[0][select] == str[0][i] + j)
								{
									if(str[0][select2] != str[0][i] && str[0][select] != str[0][select2]) return true;
								}
								if(str[0][select2] == str[0][i] + j)
								{
									if(str[0][select] != str[0][i] && str[0][select2] != str[0][select]) return true;
								}
							}
						}
					}
					else
					{
						if(str[1][select] == str[1][i] && str[1][select2] == str[1][i])
						{
							if(j == 0)
							{
								if(str[0][select] == str[0][i] && str[0][select2] == str[0][i])
								{
									b[i] = true;
									b2 = checkWin(str, num + 1, 0, 0, b);
									b[i] = false;
								}
							}
							else
							{
								if(str[0][select] == str[0][i] + j)
								{
									if(str[0][select2] != str[0][i] && str[0][select] != str[0][select2])
									{
										b[i] = true;
										b2 = checkWin(str, num + 1, 0, 0, b);
										b[i] = false;
									}
								}
								if(str[0][select2] == str[0][i] + j)
								{
									if(str[0][select] != str[0][i] && str[0][select2] != str[0][select])
									{
										b[i] = true;
										b2 = checkWin(str, num + 1, 0, 0, b);
										b[i] = false;
									}
								}
							}
						}
						/*if(((str[0][select] == str[0][i] + j && j != 0) || (j == 0 && str[0][select] == str[0][i])) && str[1][select] == str[1][i])
						{
							if((j == 0 && str[0][select2] == str[0][i]) || (j != 0 && str[0][select2] != str[0][i]))
							{
								//System.err.println(str[0][i] + " " + num + " " + j);
								b[i] = true;
								b2 = checkWin(str, num + 1, 0, 0, b);
								b[i] = false;
							}
						}
						if(((str[0][select2] == str[0][i] + j && j != 0) || (j == 0 && str[0][select2] == str[0][i])) && str[1][select2] == str[1][i])
						{
							if((j == 0 && str[0][select] == str[0][i]) || (j != 0 && str[0][select] != str[0][i]))
							{
								//System.err.println(str[0][i] + " " + num + " " + j);
								b[i] = true;
								b2 = checkWin(str, num + 1, 0, 0, b);
								b[i] = false;
							}
						}//*/
					}
				}
			}
		}
		return b2;
	}

	public static int loop(int num, int sum, int max, boolean[] b, int now, int upper)
	{
		int a = num;
		if(max == now)
		{
			int c = 0;
			for(int i = 0; i < 10; i++)
			{
				if(b[i]) c += i;
			}
			for(int i = upper; i < 10; i++)
			{
				if(b[i]) continue;
				if(c + i == sum)
				{
					//System.err.println(sum + " " + c + " " + i);
					a++;
				}
			}
		}
		else
		{
			for(int i = upper; i < 10; i++)
			{
				if(b[i]) continue;
				b[i] = true;
				a = loop(a, sum, max, b, now + 1, i);
				b[i] = false;
			}
		}
		return a;
	}

	public static int[] toIntArray(int a)
	{
		int b[] = new int[8];
		for(int i = 0; i < 8; i++)
		{
			b[i] = (a >> (i * 3) & 0b111);
		}
		return b;
	}

	public static int toInt(int[] a)
	{
		int b = 0;
		for(int i = a.length - 1; i >= 0; i--)
		{
			b = b << 3;
			b+=a[i];
		}
		return b;
	}

	public static int toInt(Integer[] a)
	{
		int b = 0;
		for(int i = a.length - 1; i >= 0; i--)
		{
			b = b << 3;
			b+=a[i];
		}
		return b;
	}

	static void QuickSort(int[] d, int left, int right) {
		if (left>=right) {
			return;
		}
		int p = d[(left+right)/2];
		int l = left, r = right, tmp;
		while(l<=r) {
			while(d[l] < p) { l++; }
			while(d[r] > p) { r--; }
			if (l<=r) {
				tmp = d[l]; d[l] = d[r]; d[r] = tmp;
				l++; r--;
			}
		}
		QuickSort(d, left, r);
		QuickSort(d, l, right);
    }

	static void QuickSort(char[] d, int left, int right, char[] c) {
		if (left>=right) {
			return;
		}
		int p = d[(left+right)/2];
		int l = left, r = right;
		char tmp;
		while(l<=r) {
			while(d[l] < p) { l++; }
			while(d[r] > p) { r--; }
			if (l<=r) {
				tmp = d[l]; d[l] = d[r]; d[r] = tmp;
				tmp = c[l]; c[l] = c[r]; c[r] = tmp;
				l++; r--;
			}
		}
		QuickSort(d, left, r, c);
		QuickSort(d, l, right, c);
    }

	public static boolean SeparateSearch(int[] a, int b, int first, int end)
	{
		if(end - first <= 1)
		{
			if(a[first] == b) return true;
			else if(a[end] == b) return true;
			else return false;
		}
		else
		{
			int temp = (end + first) / 2;
			if(a[temp] == b) return true;
			else if(a[temp] < b) return SeparateSearch(a, b, temp, end);
			else return SeparateSearch(a, b, first, temp);
		}
	}

	public static int GCD(int x, int y)
	{
		int z = Math.max(x, y) % Math.min(x, y);
		if(z == 0) return Math.min(x, y);
		return GCD(z, Math.min(y, x));
	}

	public static int SelectionSort(int a[])
	{
		int Select = 0;
		for(int j = 0; j < a.length - 1; j++)
		{
			int[] min = {0, Integer.MAX_VALUE};
			for(int i = j; i < a.length; i++)
			{
				if(min[1] > a[i])
				{
					min[1] = a[i];
					min[0] = i;
				}
			}
			if(j != min[0])
			{
				Select++;
				swap(a, min[0], j);
			}
		}
		return Select;
	}

	public static int BubbleSort(int a[])
	{
		int swapp = 0;
		boolean flag = true;
		while(flag)
		{
			flag = false;
			for(int i = 0; i < a.length - 1; i++)
			{
				if(a[i] > a[i+1])
				{
					swapp++;
					swap(a, i, i+1);
					flag = true;
				}
			}
		}
		return swapp;
	}

	public static void swap(int[] a, int x, int y)
	{
		a[x] = a[x] ^ a[y];
		a[y] = a[x] ^ a[y];
		a[x] = a[x] ^ a[y];
	}

	public static String[] inputOne() throws IOException
	{
		String str2 = br.readLine();
		String[] str = new String[str2.length()];
		for(int i = 0; i < str.length; i++)
		{
			if(i < str.length - 1)
			{
				str[i] = str2.substring(i, i+1);
			}
			else
			{
				str[i] = str2.substring(i);
			}
		}
		return str;
	}

	public static String[] input(int Num) throws IOException
	{
		String str[] = new String[Num];
		String str2 = br.readLine();
		int j = 0;
		for(int i = 0; i < Num; i++)
		{
			if(i < Num - 1)
			{
				str[i] = str2.substring(j, str2.indexOf(" ", j));
				j = str2.indexOf(" ", j) + 1;
			}
			else
			{
				str[i] = str2.substring(j);
			}
		}
		return str;
	}

	public static String[] input(int Num, String separate) throws IOException
	{
		String str[] = new String[Num];
		String str2 = br.readLine();
		int j = 0;
		for(int i = 0; i < Num; i++)
		{
			if(i < Num - 1)
			{
				str[i] = str2.substring(j, str2.indexOf(separate, j));
				j = str2.indexOf(separate, j) + 1;
			}
			else
			{
				str[i] = str2.substring(j);
			}
		}
		return str;
	}
	//*/

	/*

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