N = int(input())
X = [[] for a in range(N)]
for a in range(N-1):
    u,v = map(int,input().split())
    X[u-1].append(v-1)
    X[v-1].append(u-1)




Ans = 0
for a in range(N):
    W = [False for a in range(N)]
    Z = [a]
    W[a] = True
    t = 0
    while len(Z) >= 1 and t < 3:
        T = []
        for x in Z:
            for y in X[x]:
                if not W[y]:
                    T.append(y)
                    W[y] = True
                    Ans += 1
        t += 1
        Z = T.copy()

print(Ans//2)