//warning, the final calculation takes a LONG time
Stage #:1
Please input the craft's stage name: A
      Please enter the engine's ISP: 5
Please enter the craft's total mass: 5
       Please enter the fuel's mass: 4
dV of this stage is 78.916
Stage #:2
Please input the craft's stage name: B
      Please enter the engine's ISP: 1
Please enter the craft's total mass: 1
       Please enter the fuel's mass: .9
dV of this stage is 22.5806
Stage #:3
Please input the craft's stage name: C
      Please enter the engine's ISP: 2
Please enter the craft's total mass: 2
       Please enter the fuel's mass: 1
dV of this stage is 13.5949
   Please enter your target dV: 3000
Please enter your engine's ISP: 100
   Please enter payload weight: 100
Efficient calculation of fuel mass gives fuel mass= 2030.94
fuelMass of 2030.94 achieved dV of 3000
Would you like to do this all again?! (y/n): n