int main ()
{
	int a,b,c,d,e,f,t;
	do
	{
		scanf("%d %d %d %d %d %d\n",&a,&b,&c,&d,&e,&f);
		t=12*60*60+d*60*60+e*60+f-a*60*60-b*60-c;
		if(t!=43200){
			printf("%d\n",t);
		}
	}
	while(a!=0);
	return 0;
}