use std::collections::{HashMap, HashSet};


struct UnionFind {
    n: usize,
    parents: Vec<usize>,
    depths: Vec<usize>,
    chains: Vec<usize>,
}

impl UnionFind {
    fn new(n: usize) -> Self {
        UnionFind {
            n: n,
            parents: (0..n).collect(),
            depths: vec![0; n],
            chains: vec![1; n],
        }
    }

    fn equiv(&mut self, a: usize, b: usize) -> bool {
        self.find(a) == self.find(b)
    }
    
    fn unite(&mut self, a: usize, b: usize) {
        if self.equiv(a, b) { return; }
        let x = self.parents[a];
        let y = self.parents[b];
        if self.depths[x] > self.depths[y] {
            self.parents[x] = self.parents[y];
            self.chains[y] += self.chains[x];
        } else {
            self.parents[y] = self.parents[x];
            self.chains[x] += self.chains[y];
            if self.depths[x] == self.depths[y] {
                self.depths[x] += 1;
            }
        }
    }

    fn find(&mut self, a: usize) -> usize {
        if self.parents[a] == a { return a; }
        let p = self.find(self.parents[a]);
        self.parents[a] = p;
        p
    }

    fn chain_cnt(&mut self, i: usize) -> usize {
        let idx = self.find(i);
        self.chains[idx]
    }
}

fn main() {
    let mut ndw = String::new();
    std::io::stdin().read_line(&mut ndw).ok();
    let ndw: Vec<usize> = ndw.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let n = ndw[0];
    let d = ndw[1];
    let w = ndw[2];
    let mut cuf = UnionFind::new(n);
    let mut wuf = UnionFind::new(n);
    for _ in 0..d {
        let mut ab = String::new();
        std::io::stdin().read_line(&mut ab).ok();
        let ab: Vec<usize> = ab.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
        let a = ab[0]-1;
        let b = ab[1]-1;
        cuf.unite(a, b);
    }
    for _ in 0..w {
        let mut ab = String::new();
        std::io::stdin().read_line(&mut ab).ok();
        let ab: Vec<usize> = ab.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
        let a = ab[0]-1;
        let b = ab[1]-1;
        wuf.unite(a, b);
    }

    let mut wchildren = vec![0usize; n];
    for i in 0..n {
        wchildren[wuf.find(i)] += 1;
    }
    let mut mapping = HashMap::new();
    for i in 0..n {
        mapping.entry(cuf.find(i)).or_insert(HashSet::new()).insert(wuf.find(i));
    }
    let mut children = vec![0usize; n];
    for (&root, wroots) in mapping.iter() {
        children[root] = wroots.iter().map(|&v| wchildren[v]).sum::<usize>();
    }
    let result = (0..n).map(|i| children[cuf.find(i)]).sum::<usize>();
    println!("{}", result-n);
}