#![allow(unused_imports)]
#![allow(dead_code)]
#![allow(unused_variables)]

//use itertools::Itertools;
use std::cmp::{max, min, Reverse};
use std::collections::{BTreeMap, BTreeSet, BinaryHeap, HashMap, HashSet, VecDeque};
use std::f64::consts::PI;
use std::io::prelude::*;
use std::io::{stdin, stdout, BufWriter, Write};
use std::time::Instant;
use std::vec;

/*
use rand::distributions::{Distribution, Uniform};
use rand_chacha::{rand_core::SeedableRng, ChaCha8Rng};
use core::ops::{Add,Sub,Mul,Div};
use itertools::Itertools;
*/

const M1: i64 = 1000_000_007;
const M2: i64 = 998244353;
fn main() {
    //let mut out: BufWriter<std::io::StdoutLock<'_>> = BufWriter::new(stdout().lock());

    input! {
        n: usize,
        m: usize,
        color: [usize; n],
        uv: [(usize,usize);m]
    }

    let mut color_group: Vec<Vec<usize>> = vec![vec![]; n + 1];

    let mut graph: Vec<Vec<usize>> = vec![vec![]; n + 1];

    for i in 0..m {
        graph[uv[i].0].push(uv[i].1);
        graph[uv[i].1].push(uv[i].0);
    }

    for i in 0..n {
        color_group[color[i]].push(i + 1);
    }

    let mut ans = 0;

    for i in 0..n {
        if color_group[i + 1].len() == 0 {
            continue;
        } else {
            let mut visited = vec![false; n + 1];
            dfs(color_group[i + 1][0], &color, &graph, &mut visited);
            for &j in color_group[i + 1].iter() {
                if !visited[j] {
                    dfs(j, &color, &graph, &mut visited);
                    ans += 1;
                }
            }
        }
    }
    println!("{}", ans);

    //write!(out,"{}\n",ans).unwrap();
}

pub fn dfs(start: usize, color: &Vec<usize>, graph: &Vec<Vec<usize>>, visited: &mut Vec<bool>) {
    visited[start] = true;
    for &i in graph[start].iter() {
        if visited[i] || color[i - 1] != color[start - 1] {
            continue;
        } else {
            dfs(i, color, graph, visited);
        }
    }
}

pub mod my_proconio {
    #[macro_export]
    macro_rules! input {
        (source = $s:expr, $($r:tt)*) => {
            let mut iter = $s.split_whitespace();
            let mut next = || { iter.next().unwrap() };
            input_inner!{next, $($r)*}
        };
        ($($r:tt)*) => {
            let stdin = std::io::stdin();
            let mut bytes = std::io::Read::bytes(std::io::BufReader::new(stdin.lock()));
            let mut next = move || -> String{
                bytes
                    .by_ref()
                    .map(|r|r.unwrap() as char)
                    .skip_while(|c|c.is_whitespace())
                    .take_while(|c|!c.is_whitespace())
                    .collect()
            };
            input_inner!{next, $($r)*}
        };
    }

    #[macro_export]
    macro_rules! input_inner {
        ($next:expr) => {};
        ($next:expr, ) => {};

        ($next:expr, $var:ident : $t:tt $($r:tt)*) => {
            let $var = read_value!($next, $t);
            input_inner!{$next $($r)*}
        };

        ($next:expr, mut $var:ident : $t:tt $($r:tt)*) => {
            let mut $var = read_value!($next, $t);
            input_inner!{$next $($r)*}
        };
    }

    #[macro_export]
    macro_rules! read_value {
        ($next:expr, ( $($t:tt),* )) => {
            ( $(read_value!($next, $t)),* )
        };

        ($next:expr, [ $t:tt ; $len:expr ]) => {
            (0..$len).map(|_| read_value!($next, $t)).collect::<Vec<_>>()
        };

        ($next:expr, chars) => {
            read_value!($next, String).chars().collect::<Vec<char>>()
        };

        ($next:expr, usize1) => {
            read_value!($next, usize) - 1
        };

        ($next:expr, $t:ty) => {
            $next().parse::<$t>().expect("Parse error")
        };
    }
}