#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
using mint = modint998244353;
using vi = vector<int>;
using vvi = vector<vi>;
using vvvi = vector<vvi>;
using vll = vector<ll>;
using vvll = vector<vll>;
using vvvll = vector<vvll>;
using vmi = vector<mint>;
using vvmi = vector<vmi>;
using vvvmi = vector<vvmi>;
#define all(a) (a).begin(), (a).end()
#define rep2(i, m, n) for (int i = (m); i < (n); ++i)
#define rep(i, n) rep2(i, 0, n)
#define drep2(i, m, n) for (int i = (m)-1; i >= (n); --i)
#define drep(i, n) drep2(i, n, 0)


int main(){
    int n, m; cin >> n >> m;
    dsu d(n);
    vi c(n); rep(i, n)cin >> c[i];
    rep(i, m){
        int u, v; cin >> u >> v;
        u--; v--;
        if(c[u] == c[v])d.merge(u,v);
    }
    vi cnt(n+1, 0);
    vvi g = d.groups();
    for(auto v : g){
        cnt[c[v[0]]]++;
    }
    int ans = 0;
    rep(i, n+1){
        if(cnt[i] == 0)continue;
        ans += cnt[i]-1;
    }cout << ans << endl;

    return 0;
}