n=int(input())
edge=[[] for i in range(n)]
isroot=[True]*n
for i in range(n-1):
    a,b=map(int,input().split())
    a-=1;b-=1
    edge[a].append(b)
    isroot[b]=False
Root=0
for i in range(n):
    if isroot[i]:Root=i;break   
order = []
par = [-1]*n
tank = [Root]
depth=[0]*n
while tank:
    pele = tank.pop()
    order.append(pele)
    for e in edge[pele]:
        if e == par[pele]:
            continue
        tank.append(e)
        par[e] = pele
        depth[e]=depth[pele]+1
size = [1]*n
for e in order[::-1]:
    if e == Root:
        break
    size[par[e]] += size[e]
ans=0
for i in range(n):
    ans+=size[i]*depth[i]
print(ans)