int main()
{
    int sum,a,b,c,d,e,f;
	while(cin>>a>>b>>c>>d>>e>>f&&(a!=0||b!=0||c!=0||d!=0||e!=0||f!=0))
	{
		sum=(d+12-a)*3600+(e-b)*60+f-c;
		cout<<sum<<endl;
	}
	return 0;
}
