#include <bits/stdc++.h>
using namespace std;
#include <atcoder/dsu>
using namespace atcoder;
int main() {
  int N, M;
  cin >> N >> M;
  vector<int> C(N);
  for (int i = 0; i < N; i++) {
    cin >> C[i];
  }
  dsu Union(N);
  for (int i = 0; i < M; i++) {
    int u, v;
    cin >> u >> v;
    u--, v--;
    if (C[u] == C[v]) {
      Union.merge(u, v);
    }
  }
  auto g = Union.groups();
  vector<int> cnt(N + 1, 0);
  for (auto x : g) {
    // for (auto y : x) cout << y << " ";
    // cout << endl;
    cnt[C[x[0]]]++;
  }
  int ans = 0;
  for (int i = 1; i <= N; i++) {
    if (cnt[i] > 0) {
      ans += cnt[i] - 1;
    }
  }
  cout << ans << endl;
  return 0;
}