#include <iostream>

using namespace std;

int main() {

    int n,k;

    cin >> n >> k;

    for(int i =  ; i < n; ++ i){

        for(int j =  ;  j < n ; ++ j){

            if(j != ) cout<<" ";

            if( i == j) cout<<k;

            else cout<<;

        }

        cout<<endl;

    }

    return ;

}