x = n = int(input())
uv = [[v-1 for v in map(int,input().split())] for _ in range(n-1)]
adj = [[] for _ in range(n)]
for u,v in uv: adj[u].append(v); adj[v].append(u)
for i in range(n): x += len(adj[i])*(len(adj[i])-1)//2
for u,v in uv: x += (len(adj[u])-1)*(len(adj[v])-1)
print(x-1)