class Edge:
    def __init__(selft,e = None,next = None):
        self.e = e
        self.next = next
class Node:
    def __init__(self,first = None):
        self.first = first

e = [Edge() for i in range(5)]
e = [Edge(1,None), Edge(2,e[2]), Edge(3,None), Edge(2,None), Edge(0,None)]
n = [e[0], e[1], e[3], e[4]]