50 50 50 50
 49 49 4 1
 48 50 12 11
 5 7 1 10
 1 50 50 50
 5 7 1 4
 32 4 17 3
 1 50 1 50
 50 1 1 1
 32 31 10 9
 5 7 4 1
 49 49 3 3
 50 49 1 2
 50 48 3 1
 50 1 1 50
 5 7 10 10
 1 1 1 1
 49 50 11 12

Second
 Second
 Second
 Second
 Second
 Second
 First
 Second
 First
 First
 Second
 Second
 First
 First
 First
 Second
 Second
 Second

import java.util.Scanner;


public class Div209A {

	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		Integer nr = in.nextInt();
        Integer sum = in.nextInt();
        
        for(int i=0;i<nr;i++){
        	for(int j=0;j<nr;j++){
            		if(i==j){
            			System.out.print(sum+ " ");
            		}
            		else{
            			
                			System.out.print(0 +" ");
                		
            		}
        }
        System.out.println();
        
	}
}
	
}