N=int(input())
point=[0]*N
dat=[]
for _ in range(N-1):
    u,v=map(int,input().split())
    dat.append((u,v))
    point[u-1]+=1
    point[v-1]+=1
ans=0
ans2=0
for u,v in dat:
    ans+=1
    ans+=(point[u-1]-1)*(point[v-1]-1)
    ans2+=point[u-1]+point[v-1]-2
print(ans+ans2//2)