int main(){
    int h1,m1,s1,h2,m2,s2;
    scanf("%d%d%d%d%d%d",&h1,&m1,&s1,&h2,&m2,&s2);
    int s;
	while(h1!=0||m1!=0||s1!=0||h2!=0||m2!=0||s2!=0){
		h2=h2+12;
		s=(h2-h1)*3600-m1*60-s1+m2*60+s2;
		printf("%d\n",s);
		scanf("%d%d%d%d%d%d",&h1,&m1,&s1,&h2,&m2,&s2);
	}
	return 0;
}