import sys
from collections import deque
stdin=sys.stdin

ip=lambda: int(sp())
fp=lambda: float(sp())
lp=lambda:list(map(int,stdin.readline().split()))
sp=lambda:stdin.readline().rstrip()
yp=lambda:print('Yes')
np=lambda:print('No')

n=ip()
tonari=[[] for _ in range(n)]
st=[-1 for _ in range(n)]
for _ in range(n-1):
    a,b=lp()
    tonari[a-1].append(b-1)
    st[b-1]-=1

for i in range(n):
    if st[i]==-1:
        stx=i
        break
st[stx]=0
d={}
d[0]=1
q=deque([stx])
while q:
    now=q.popleft()
    for j in tonari[now]:
        if st[j]==-2:
            st[j]=st[now]+1
            if st[now]+1 not in d:
                d[st[now]+1]=0
            d[st[now]+1]+=1
            q.append(j)

ans=0
st.sort(reverse=True)
s=sum(st)
rest=n-1
for j in st:
    if d[j]!=0:
        ans+=s
        s-=rest
        rest-=d[j]
        d[j]=0
print(ans)