Cars

import java.util.*;
import java.io.*;
import java.math.*;

/* Name of the class has to be "Main" only if the class is public. */
class Codechef {

  static StringBuilder str = new StringBuilder("");
  static int l,b;
  static boolean vis[][];

    static boolean isValid(int x,int y)
    {
        return (x>=0&&y>=0&&x<l&&y<b);
    }

    static void dfs(int mat[][],int x,int y)
    {
        vis[x][y]=true;
        if(isValid(x,y+1) && (mat[x][y+1]==1) && (!vis[x][y+1]))
            dfs(mat,x,y+1);
        if(isValid(x,y-1) && (mat[x][y-1]==1) && (!vis[x][y-1]))
            dfs(mat,x,y-1);
        if(isValid(x+1,y) && (mat[x+1][y]==1) && (!vis[x+1][y]))
            dfs(mat,x+1,y);
        if(isValid(x-1,y) && (mat[x-1][y]==1) && (!vis[x-1][y]))
            dfs(mat,x-1,y);
    }

    static void solve(int mat[][])
    {
        vis=new boolean[l][b];
        int ans=0;
        for(int i=0;i<l;i++)
        {
            for(int j=0;j<b;j++)
            {
                if((!vis[i][j]) && mat[i][j]==1)
                {
                    ans++;
                    dfs(mat,i,j);
                }
            }
        }
        System.out.println(ans);
    }

  public static void main(String[] args) throws java.lang.Exception {

    l=2;
    b=2;
    int mat[][]={{1,0},{0,1}};
    solve(mat);
  }
}