int main()
{
    int i,m,sum,n,h1,m1,s1,h2,m2,s2;
    scanf("%d%d%d%d%d%d",&h1,&m1,&s1,&h2,&m2,&s2);
    while (1)
    {    
    h2=h2+12;
    sum=0;
    m=s2-s1;
    if (m<0) 
    {
       m=m+60;
       m2--;
       }
    sum=sum+m;
    m=m2-m1;
    if (m<0) 
    {
       m=m+60;
       h2--;
       }
     sum=sum+m*60;
     m=h2-h1; 
     sum=sum+m*3600;
      printf("%d",sum);
      scanf("%d%d%d%d%d%d",&h1,&m1,&s1,&h2,&m2,&s2);
      if ((h1==0)&&(m1==0)&&(s1==0)&&(h2==0)&&(m2==0)&&(s2==0)) break;
      else printf("\n");
     } 
    
     return 0;
}             
    
