stations = [['debut', 0], ['A', 150], ['B', 250], ['C', 350], ['D', 450], ['E', 570], ['F', 600], ['G', 650], ['H', 800], ['I', 1100], ['J', 1200], ['K', 1400], ['L', 1500], ['M', 1500], ['N', 1600], ['O', 1750], ['P', 1800], ['fin', 2000]]