import sys
n = int(input())
g = [[] for _ in range(n)]
is_child = [0]*n
for i in range(n-1):
    a,b = map(int,sys.stdin.readline().split())
    g[a-1].append(b-1)
    is_child[b-1] = 1
root = is_child.index(0)

order = []
st = [root]
parent = [-1]*n
depth = [1]*n
while st:
    v = st.pop()
    order.append(v)
    for c in g[v]:
        if c != parent[v]:
            st.append(c)
            parent[c] = v
            depth[c] = depth[v] + 1

size = [1]*n
for i in order[::-1]:
    if i==root: break
    size[parent[i]] += size[i]

ans = 0
for i in range(n):
    if i==root: continue
    ans += size[i]*depth[parent[i]]
print(ans)