//mosyasu

#include<bits/stdc++.h>
using namespace std;

int main(){
	int n; cin >> n;
	vector ikeru(n, vector<int>(0));
	for (int i=0; i<n-1; i++){
		int u, v; cin >> u >> v;
		u--; v--;
		ikeru[u].push_back(v);
		ikeru[v].push_back(u);
	}

	long long ans = 0;
	vector dp(n, vector<long long>(4));
	vector<int> mx(n, 0);

	auto dfs = [&](auto self, int i, int p) -> void {
		dp[i][0] = 1;
		mx[i] = 1;
		for (int j: ikeru[i]){
			if (j == p) continue;
			self(self, j, i);
			for (int x=0; x<mx[i]; x++){
				for (int y=0; y<mx[j]; y++){
					if (x+y+1 > 3) break;
					ans += dp[i][x] * dp[j][y];
				}
			}
			for (int x=0; x<min(3,mx[j]); x++){
				dp[i][x+1] += dp[j][x];
			}
			mx[i] = min(4, max(mx[i], mx[j]+1));
		}
	};

	dfs(dfs, 0, -1);
	cout << ans << '\n';
}