int main(){
	int a,b,c,d,e,f;
	int m;
	
	scanf("%d %d %d %d %d %d",&a,&b,&c,&d,&e,&f);
	while(a!=0||b!=0||c!=0||d!=0||e!=0||f!=0){
		m=3600*(12+d-a)+60*(e-b)+(f-c);
		printf("%d\n",m);
		scanf("%d %d %d %d %d %d",&a,&b,&c,&d,&e,&f);
	}
	return 0;
}