#include <bits/stdc++.h>




namespace zawa {

using i16 = std::int16_t;
using i32 = std::int32_t;
using i64 = std::int64_t;
using i128 = __int128_t;

using u8 = std::uint8_t;
using u16 = std::uint16_t;
using u32 = std::uint32_t;
using u64 = std::uint64_t;

using usize = std::size_t;

} // namespace zawa


namespace zawa {

void SetFastIO() {
    std::cin.tie(nullptr)->sync_with_stdio(false);
}

void SetPrecision(u32 dig) {
    std::cout << std::fixed << std::setprecision(dig);
}

} // namespace zawa
using namespace zawa;

int main() {
    SetFastIO();

    int n; std::cin >> n;
    std::vector g(n, std::vector<int>{});
    for (int _{} ; _ < n - 1 ; _++) {
        int u, v; std::cin >> u >> v;
        u--; v--;
        g[u].emplace_back(v);
        g[v].emplace_back(u);
    }

    std::map<std::tuple<int, int, int>, int> dp;
    auto rec{[&](auto rec, int v, int p, int d) -> int {
        std::tuple<int, int, int> tup{ v, p, d };
        if (dp.contains(tup)) return dp[tup];
        dp[tup] = 1;
        if (d == 0) return dp[tup];
        for (auto x : g[v]) if (x != p) {
            dp[tup] += rec(rec, x, v, d - 1);
        }
        return dp[tup];
    }};
    long long ans{};
    for (int v{} ; v < n ; v++) {
        ans += rec(rec, v, -1, 3) - 1;
    }
    ans /= 2;
    std::cout << ans << '\n';
}