Model ropes
  ! Ropes problem - integer variables
  Variables
    intx[1:3] = 0, >=0
    inty[1:4] = 0, >= 0
    A = 0
    B = 0
    p = 0
  End Variables
  Equations
  maximize p 
  p <= 0.5 * A
  p <= B
  A = 2*intx[1] + 3*intx[3]+4*inty[2]+3*inty[3]+inty[4]
  B = intx[1]+  2*intx[2] + 3*inty[1] + inty[3] + 2*inty[4]
  400 >= intx[1]+intx[2]+intx[3]
  100 >= inty[1]+inty[2]+inty[3]+inty[4]
  End Equations
End Model