use proconio::{input, marker::Usize1};

fn main() {
    input! {
        n:usize,
        uv:[(Usize1,Usize1);n-1],
    }

    let mut g = vec![vec![]; n];
    for &(u, v) in uv.iter() {
        g[u].push(v);
        g[v].push(u);
    }

    let mut childs = vec![0; n];
    let mut dp = vec![0; n];
    f(0, n, n, &g, &mut childs, &mut dp);
    let ans = dp.iter().sum::<usize>();
    println!("{}", ans);
}

fn f(
    crr: usize,
    prv: usize,
    n: usize,
    g: &Vec<Vec<usize>>,
    childs: &mut Vec<usize>,
    dp: &mut Vec<usize>,
) {
    for &nxt in g[crr].iter() {
        if nxt == prv {
            continue;
        }

        f(nxt, crr, n, g, childs, dp);
        childs[crr] += childs[nxt];
        dp[crr] += childs[nxt] * (n - childs[nxt]);
    }
    childs[crr] += 1;
    dp[crr] += (n - childs[crr]) * childs[crr];
    dp[crr] += n;
}