<prompt> Human: Some stuff you should know before responding:My one friend is very wealthy and has houses in England for us to stay at.I have a house on an island in Greece.We plan on spending at least a month there to take in everything from the different countries.We definitely want to go to Amsterdam, Greece, Italy, France and England. Any others highly recommended we could try to visit also. About the financing: I am probably the youngest one going, I will be going into my junior year and be 16 yo. The rest of my friends will be going because they are are graduating senior year. I hang out with older people. I want to use this as my early graduation present because i wan to explore the world with my friends. I basically want to know an estimate on how much money Id need to spend a month backpacking. We are flying there from New Jersey, U.S..Can anyone help me?  <response>: We know nothing about your spending habits. Except half way through high school is somehow early graduation gift time. 