UVA - 696 - How Many Knights

#include <stdio.h>
#include <math.h>

int main()
{   int x,y;
    while(1){
        scanf("%d %d",&x,&y);
        if(x==0 && y==0)
            break;
        if(x==1 || y==1){
            printf("%d knights may be placed on a %d row %d column board.\n",x*y,x,y);
        }
        else if(x==2 || y==2){
            int temp=ceil(x*y/8.0)*4;
            if(x>3){
                if(x%4==1){
                    temp-=2;
                }
            }
            if(y>3){
                if(y%4==1){
                    temp-=2;
                }
            }
            printf("%d knights may be placed on a %d row %d column board.\n",temp,x,y);
        }
        else if(x%2==0 ||y%2==0){
            printf("%d knights may be placed on a %d row %d column board.\n",y*x/2,x,y);
        }
        else{
           printf("%d knights may be placed on a %d row %d column board.\n",((y/2)+1)*((x/2)+1)+(y/2)*(x/2),x,y);
        }
    }
       return 0;
}