> #include <stdio.h>
> #include <memory.h>
> #define M 1000
> int used[M+5][M+5];
> __int64 s,X,Y,dx,dy;
> __int64 fx,fy;
> int solve(){
> 	__int64 x,y;
> 	int sum=0;
> 	while((X/s+Y/s)%2==0||(X%s)==0||(Y%s)==0){//如果不满足就表示已经进入了白格
> 		x=X%s;
> 		y=Y%s;
> 		if(used[x][y]==1) return -1;
> 		used[x][y]=1;
> 		X+=dx;
> 		Y+=dy;
> 		sum++;
> 	}
> 	fx=X;
> 	fy=Y;
> 	return sum;
> }
> int main(){
> 	scanf("%I64d%I64d%I64d%I64d%I64d",&s,&X,&Y,&dx,&dy);
> 	while(s!=0||X!=0||Y!=0||dx!=0||dy!=0){
> 		memset(used,0,sizeof(used));
> 		int r=solve();
> 		if(r==-1)
> 			printf("The flea cannot escape from black squares.\n");
> 		else 
> 			printf("After %d jumps the flea lands at (%I64d, %I64d).\n",r,fx,fy);
> 		scanf("%I64d%I64d%I64d%I64d%I64d",&s,&X,&Y,&dx,&dy);
> 	}
> 	return 0;
> }