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> #include<iostream>
> using namespace std;
> int main()
> {
>     int p,e,i,d,x,n;
>     cin>>p>>e>>i>>d;
>     x=i;n=1;
>     while(p!=-1&&e!=-1&&i!=-1&&d!=-1)
>     {                         
>       while(!((x-p)%23==0&&(x-e)%28==0))
>         x+=33;
>        if(p==e&&i==e&&p==i&&d==p) 
>            cout<<"Case "<<n<<": the next triple peak occurs in "<<21252<<" days."<<endl;
> 	  else
> 	  {
> 		if(x!=0)
>         cout<<"Case "<<n<<": the next triple peak occurs in "<<x-d<<" days."<<endl;
>        else
>         cout<<"Case "<<n<<": the next triple peak occurs in "<<21252-d<<" days."<<endl;
> 	  }
>        n++;
>         cin>>p>>e>>i>>d; 
>         x=i;
>       }   
>    return 0;
> }