int main()
{
	int s,v,t,m,n,k,l;
	scanf("%d%d",&s,&v);
	if(s%v==0)
	{
		t=s/v;	
	}else
	{
		t=s/v+1;
	}
	m=t%60;//分钟 
	n=t/60;//小时
	l=60-m-10;
	if(l<0)
	{
		n++;
		l+=60;
	}
	k=8-n-1;
	if(k<=0)
	k+=24;  
	
	printf("%02d:%02d",k,l);

	return 0;
}```