Mercedes A 140 Can I afford this? please for help

Hello, so my question was if I could have a Mercedes A 140 set. I’ll be living alone soon and the youth welfare office will pay 450 euros a month, for food about 150 euros are expected, that would be 300 euros, of which still goes clothes, household funds and so on. You think I have more reason, if everything you have to pay the money enough to entertain an a 140? So with 450 euros the rent is already deducted and additional costs from the apartment. I just don’t know what ic h to get pocket money and how much I still have left etc. I have to drive on the day from August 5 times a week about 30 to 40 km, that would be about 800 kilometers a month, I think the a 140 that you know better consumes about 8 liters in the city. That would then be 100 euros of gasoline going on, but I would get 50 euros monthly from family for the car. Thank you in advance My next question is, there is still a car that is even cheaper than the A 140, less Fuel consumed and has less insurance? Thanks also there