/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
	int [][]arr= {{1,1,1,1}, {1,1,0,0}, {1,0,0,0}, {1,1,0,0},};
      int rownum=0;
      int i = 0;  
      int j = 4-1;
       while(i<arr.length+1 && j>0)
           {
             if(arr[i][j]==0)
              {
                j--;
                rownum=i; 
              }
             else
              i++;
            }
        System.out.println(rownum); 
	}
}

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