#include <stdio.h>

FILE *z,*y;

long n,k,i,j,u[1001][1001],q=0;

int main()
{

 z=fopen("tablete.in","r");
 y=fopen("tablete.out","w");

 fscanf(z,"%ld %ld", &n, &k);
 fclose(z);

 for (i=1;i<=n;i++)
  for (j=1;j<=k;j++)
	{
	 q++;
	 u[i][j]=q;
	}
 if (k%2==1)
   for (i=1;i<=n-1;i=i+2)
	{
	 ui][k]++;
	 u[i+1][1]--;
	}

 for (i=1;i<=n;i++)
  for (j=k+1;j<=n;j++)
	{
	 q++;
	 u[i][j]=q;
	}
 if (n%2==1 && k%2==1)
	{
	 u[1][k+1]--;
	 u[n][k]++;
	}

 

 fclose(z);
 return(0)
 }