public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int t = sc . nextInt ( ) ;
  while ( t -- > 0 ) {
    int a = sc . nextInt ( ) ;
    int b = sc . nextInt ( ) ;
    int x = sc . nextInt ( ) ;
    int y = sc . nextInt ( ) ;
    int n = sc . nextInt ( ) ;
    long res1 = 0 , res2 = 0 , a1 , b1 , a2 , b2 ;
    a1 = Math . max ( a - n , x ) ;
    b1 = Math . max ( b - Math . max ( n - ( a - x ) , 0 ) , y ) ;
    a2 = Math . max ( b - n , y ) ;
    b2 = Math . max ( a - Math . max ( n - ( b - y ) , 0 ) , x ) ;
    System . out . println ( Math . min ( a1 * b1 , a2 * b2 ) ) ;
  }
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int t = sc . nextInt ( ) ; while ( t -- > 0 ) { int a = sc . nextInt ( ) ; int b = sc . nextInt ( ) ; int x = sc . nextInt ( ) ; int y = sc . nextInt ( ) ; int n = sc . nextInt ( ) ; long res1 = 0 , res2 = 0 , a1 , b1 , a2 , b2 ; a1 = Math . max ( a - n , x ) ; b1 = Math . max ( b - Math . max ( n - ( a - x ) , 0 ) , y ) ; a2 = Math . max ( b - n , y ) ; b2 = Math . max ( a - Math . max ( n - ( b - y ) , 0 ) , x ) ; System . out . println ( Math . min ( a1 * b1 , a2 * b2 ) ) ; } }
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