So I've used this website :
https://bitcoinwisdom.com/bitcoin/difficulty

with this on Ebay : 136USD - AntMiner S3+ 445 GH/s 350W

The result is : 19.4 USB/month
In France, it's 0,165 USD for 1kW/h

So 1 month with 350W is 260kW/h => 42,9USD

It means that it's impossible to earn money in France ?