import collections

def solve():
    ans=0
    n=int(input())
    side=[]
    degree=[0 for i in range(n)]
    for i in range(n-1):
        a,b=map(int,input().split())
        side.append((a,b))
        degree[a-1]+=1
        degree[b-1]+=1
    c = collections.Counter(degree)
    if c[1]==2:
        return 0
    ck = sorted(c.keys(),reverse=True)

    #
    #   o--o--o
    # |||     |||
    # ooo     ooo
    # |||     |||
    # ooo     ooo

    for k in ck:
        if k > 2:
            ans+=(k-2)*c[k]
            #if c[1]>=k-2:
            #    c[1]-=k-2
            #    c[2]+=k-2
    return ans
print(solve())