



"""simple docstring"""
from collections import defaultdict





def      __magic_name__				(							lowercase ):
   SCREAMING_SNAKE_CASE_: str     			=1
   SCREAMING_SNAKE_CASE_: int     			=True
   for v in tree[start]:
      if v not in visited:
         ret += dfs(lowercase )
   if ret % 2 == 0:
      cuts.append(lowercase )
   return ret





def      __magic_name__				(							):
   dfs(1 )


if __name__ == "__main__":
   _UpperCAmelCase, _UpperCAmelCase     =			1_0, 9
   _UpperCAmelCase     =			defaultdict(list)
   _UpperCAmelCase     =			{}
   _UpperCAmelCase     =			[]
   _UpperCAmelCase     =			0
   _UpperCAmelCase     =			[(2, 1), (3, 1), (4, 3), (5, 2), (6, 1), (7, 2), (8, 6), (9, 8), (1_0, 8)]
   for u, v in edges:
      tree[u].append(v)
      tree[v].append(u)
   even_tree()
   print(len(cuts) - 1)








"""simple docstring"""
from math import pi





def      __magic_name__				(							lowercase							,			lowercase ):
   return 2 * pi * radius * (angle / 360)


if __name__ == "__main__":
   print(arc_length(9_0, 1_0))



