use std::io::{BufRead, BufWriter, Write, StdinLock, StdoutLock};

fn input(stdin: &mut StdinLock) -> String {
    let mut input = String::new();
    stdin.read_line(&mut input).ok();
    input
}

macro_rules! read {
    ($stdin:expr, [$t:tt; $n:expr]) => {
        (0..$n).map(|_| read!($stdin, $t)).collect::<Vec<_>>()
    };
    ($stdin:expr, [$t:tt]) => {
        input($stdin)
            .split_whitespace()
            .map(|x| parse!(x, $t))
            .collect::<Vec<_>>()    
    };
    ($stdin:expr, ($($t:tt),*)) => {
        {
            let input = input($stdin);
            let mut iter = input.split_whitespace();    
            ( $( parse!(iter.next().unwrap(), $t) ),* )
        }
    };
    ($stdin:expr, $t:tt) => {
        parse!(input($stdin).trim(), $t)
    };
}

macro_rules! parse {
    ($s:expr, chars) => {
        $s.chars().collect::<Vec<_>>()
    };
    ($s:expr, usize1) => {
        parse!($s, usize) - 1
    };
    ($s:expr, $t:ty) => {
        $s.parse::<$t>().unwrap()
    }
}

trait ProconWrite {
    fn writeln<T: std::fmt::Display>(&mut self, x: T);
    fn writeln_iter<I: Iterator>(&mut self, iter: I)
    where
        I::Item: std::fmt::Display
    {
        self.writeln(
            iter.map(|x| x.to_string()).collect::<Vec<_>>().join(" ")
        );
    }
}
 
impl ProconWrite for BufWriter<StdoutLock<'_>> {
    fn writeln<T: std::fmt::Display>(&mut self, x: T) {
        writeln!(self, "{}", x).ok();
    }
}

struct Dsu {
    n: usize,
    parent_or_size: Vec<usize>,
}

impl Dsu {
    fn new(n: usize) -> Dsu {
        Dsu { n, parent_or_size: vec![!1; n] }
    }

    fn merge(&mut self, a: usize, b: usize) -> usize {
        let (mut x, mut y) = (self.leader(a), self.leader(b));
        if x == y { return x; }
        if !self.parent_or_size[x] < !self.parent_or_size[y] {
            std::mem::swap(&mut x, &mut y);
        }
        self.parent_or_size[x] -= !self.parent_or_size[y];
        self.parent_or_size[y] = x;
        x
    }

    fn leader(&mut self, a: usize) -> usize {
        if self.parent_or_size[a] >= self.n { return a; }
        self.parent_or_size[a] = self.leader(self.parent_or_size[a]);
        self.parent_or_size[a]
    }

    fn size(&mut self, a: usize) -> usize {
        let x = self.leader(a);
        !self.parent_or_size[x]
    }
}

fn solve(stdin: &mut StdinLock, writer: &mut BufWriter<StdoutLock>) {
    let (n, d, w) = read!(stdin, (usize, usize, usize));

    let mut car_dsu = Dsu::new(n);
    for _ in 0..d {
        let (a, b) = read!(stdin, (usize1, usize1));
        car_dsu.merge(a, b);
    }

    let mut walker_dsu = Dsu::new(n);
    for _ in 0..w {
        let (c, d) = read!(stdin, (usize1, usize1));
        walker_dsu.merge(c, d);
    }

    let mut ans = 0;
    let mut set = std::collections::HashSet::new();
    for i in 0..n {
        let x = car_dsu.leader(i);
        let y = walker_dsu.leader(i);
        if !set.insert((x, y)) { continue; }
        ans += car_dsu.size(x) * walker_dsu.size(y);
    }
    ans -= n;
    writer.writeln(ans);
}

fn main() {
    let stdin = std::io::stdin();
    let mut stdin = stdin.lock();

    let stdout = std::io::stdout();
    let mut writer = BufWriter::new(stdout.lock());

    solve(&mut stdin, &mut writer);
}