import sys
sys.setrecursionlimit(1000000)
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=[0 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]==0:
        stx=i
        break
visit=[-1 for _ in range(n)]
visit[stx]=0
d={}
d[0]=1

def dfs(now,ch):
    for j in tonari[now]:
        if visit[j]==-1:
            visit[j]=ch+1
            if ch+1 not in d:
                d[ch+1]=0
            d[ch+1]+=1
                
            dfs(j,ch+1)


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