use std::mem::swap;
use std::io::{self, BufRead};

struct UnionFind{
    parent: Vec<usize>,
    num: Vec<i64>,
}

impl UnionFind{
    fn new(n: usize)->Self{
        let parent = (0..n).into_iter().collect();
        let num = vec![1; n];
        UnionFind{
            parent, num,
        }
    }
    fn find(&mut self, x: usize)->usize{
        if x==self.parent[x]{return x;}
        self.parent[x] = self.find(self.parent[x]);
        self.parent[x]
    }

    fn union(&mut self, u: usize, v: usize){
        let (mut pu, mut pv) = (self.find(u), self.find(v));
        if pu==pv{return;}
        if self.num[pu] < self.num[pv]{
            swap(&mut pu, &mut pv);
        }
        self.num[pu] += self.num[pv];
        self.parent[pv] = pu;
    }

    fn same(&mut self, u: usize, v: usize)->bool{
        self.find(u)==self.find(v)
    }
}

fn main(){
    let stdin = io::stdin();
    let mut iterator = stdin.lock().lines();
    let first_line = iterator.next().unwrap().unwrap();
    let mut first_iter = first_line.split_whitespace();
    let n: usize = first_iter.next().unwrap().parse().unwrap();
    let m: usize = first_iter.next().unwrap().parse().unwrap();
    let second_line = iterator.next().unwrap().unwrap();
    let c: Vec<usize> = second_line
        .split_whitespace()
        .map(|x| x.parse::<usize>().unwrap() - 1) 
        .collect();
    let mut e = Vec::new();
    for _ in 0..m {
        let edge_line = iterator.next().unwrap().unwrap();
        let mut edge_iter = edge_line.split_whitespace();
        let u: usize = edge_iter.next().unwrap().parse::<usize>().unwrap() - 1;
        let v: usize = edge_iter.next().unwrap().parse::<usize>().unwrap() - 1;
        e.push((u, v));
    }
    let mut colour = vec![0; n];
    for i in 0..n{
        colour[c[i]] += 1;
    }
    let mut uf = UnionFind::new(n);
    let mut ans = 0;
    for i in 0..n{
        ans += (colour[i]-1).max(0);
    }
    for &(u, v) in &e{
        if uf.same(u, v){continue}
        if c[u]==c[v]{
            uf.union(u, v);
            ans -= 1;
        }
    }
    println!("{}", ans);
}