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#include<stdio.h>
void main()
{	int max(int *arr,int r,int c)
	{	int i,j,max=0;
		for( i=0;i<(r*c);i++)
		{	max=*arr;
			for(j=0;j<c;j++)
			{	if(*(arr+i*c+j)>max)
				{	max=*(arr+i*c+j);
				}
			}
		return max;								
	}
		
		
	
		
	}
		
	int r,c,k,i,j,m;
	scanf("%d",&r);
	scanf("%d",&c);
	k=r*c;
	int *arr;
	
	int a[r][c];
	 arr=&a[0][0];
	for(i=0;i<r;i++)
	{	for(j=0;j<c;j++)
		{	a[i][j]=k--;
		}
	}
/*	for(i=0;i<r;i++)
	{	for(j=0;j<c;j++)
		{	printf("%d",a[i][j]);
		}
	}
*/
	m=max(arr,r,c);	
	printf("%d",m);
}