from collections import defaultdict

def dfs(start):

return ret

def even_tree():

dfs(1)

if __name__ == "__main__":

n, m = 10, 9

tree = defaultdict(list)

visited = {}

cuts = []

count = 0

edges = [(2, 1), (3, 1), (4, 3), (5, 2), (6, 1), (7, 2), (8, 6), (9, 8), (10, 8)]

for u, v in edges:

tree[u].append(v)

tree[v].append(u)

even_tree()

print(len(cuts) - 1)