1#include <iostream>2using namespace std;3 4const int maxn = 1000;5int n;6int fa[maxn], cnt[maxn];7 8int getRoot(int v) {9    if (fa[v] == v) return v;10    return getRoot(fa[v]);11}12 13int main() {14    cin >> n;15    for (int i = 0; i < n; ++i) {16        fa[i] = i;17        cnt[i] = 1;18    }19    int ans = 0;20    for (int i = 0; i < n - 1; ++i) {21        int a, b, x, y;22        cin >> a >> b;23        x = getRoot(a);24        y = getRoot(b);25        ans += cnt[x] * cnt[y];26        fa[x] = y;27        cnt[y] += cnt[x];28    }29    cout << ans << endl;30    return 0;31}