#include<bits/stdc++.h>
using namespace std;
int xx[5]={0,-1,1,0,0};
int yy[5]={0,0,0,1,-1};
int ans=9999;
int n,m,sx,ex,sy,ey;
int mp[11][11],vis[11][11];
void dfs(int x,int y,int life,int step)
{
	int dx,dy;
	if(life<=0)
	{
		return;
	}
	if(mp[x][y]==4)
		life=6;
	if(x==ex&&y==ey)
	{
		ans=min(ans,step);
		return;
	}
	for(int i=1;i<=4;i++)
	{
		dx=xx[i]+x;dy=yy[i]+y;
		if(dx>=1&&dx<=n&&dy>=1&&dy<=m&&vis[dx][dy]!=1&&mp[dx][dy]!=0)
		{
				vis[dx][dy]=1;
				dfs(dx,dy,life-1,step+1);
				vis[dx][dy]=0;
		}
	}
}
int main()
{
	//freopen("text.in","r",stdin);
	//freopen("text.out","w",stdout);
	scanf("%d %d\n",&n,&m);
	for(int i=1;i<=n;i++)
	{
		for(int j=1;j<=m;j++)
		{
			scanf("%d ",&mp[i][j]);
			if(mp[i][j]==2)
			{
				sx=i;sy=j;
			}
			if(mp[i][j]==3)
			{
				ex=i;ey=j;
			}
		}
		scanf("\n");
	}
	dfs(sx,sy,6,0);
	if(ans!=9999)
		printf("%d",ans);
	else
		printf("-1");
	return 0;
}