program chasing;
Uses Math;
 
var
     Bs, Bx, By, Ds, Dx, Dy : LongInt;
     dir                       : Char;
     T : real;
begin
 
    (*assign(input,  'input.txt');  reset(input);
    assign(output, 'output.txt'); rewrite(output);*)
 
    ReadLn(Dx, Dy, Ds);
 
    ReadLn(Bx, By, Bs);
 
    ReadLn(dir);
 
    T := 0;
 
   if ((Bs=0) and (Ds<>0)) then  begin T:=(abs(Dx-Bx) + abs(Dy-By)) / Ds; WriteLn(round(T));end
                         else  if ((Bs=0) and (Ds=0)) then  writeln(-1);                                   
 
 
 
end.

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