On Monday morning, a snail fell down a well which is $$5$$ metres deep. During the day, it climbs up $$2$$ metres, and during the night it slides down $$1$$ metre. On what day of the week will the snail get out of the well? 
选项为:A:$$$$Tuesday  B:$$$$Wednesday  C:$$$$Thursday  D:$$$$Friday  E:$$$$Monday  请回答其中一个选项.