№12

#include <bits/stdc++.h>
#include <stdio.h>
#define REP(var, start, end) for(int var = start; var < end; var++)
using namespace std;

int main()
{
  unsigned int n, m;
  unsigned int iterationFiller = 1;

  scanf("%d %d", &n, &m);
  int array[n][m];

  //fill
  REP(x, 0, n)
  {
    REP(y, 0, m)
    {
      if (x % 2 != 0)
      {
        if (y % 2 == 0)
        {
          array[x][y] = 0;
        }
        else
        {
          array[x][y] = iterationFiller;
          ++iterationFiller;
        }
      }
      else
      {
        if (y % 2 == 0)
        {
          array[x][y] = iterationFiller;
          ++iterationFiller;
        }
        else
        {
          array[x][y] = 0;
        }
      }


    }
  }

  //print
  REP(x, 0, n)
  {
    REP(y, 0, m)
    {
      printf("%4d", array[x][y]);
    }
    cout<<"\n";
  }

  return 0;
}