#include<bits/stdc++.h>
namespace {
#pragma GCC diagnostic ignored "-Wunused-function"
#include<atcoder/all>
#pragma GCC diagnostic warning "-Wunused-function"
using namespace std;
using namespace atcoder;
#define rep(i,n) for(int i = 0; i < (int)(n); i++)
#define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; i--)
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
template<class T> bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; } else return false; }
template<class T> bool chmin(T& a, const T& b) { if (b < a) { a = b; return true; } else return false; }
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;

} int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n, m;
  cin >> n >> m;
  VI c(n);
  rep(i, n) cin >> c[i], c[i]--;
  dsu d(n);
  rep(_, m) {
    int u, v;
    cin >> u >> v;
    u--, v--;
    if (c[u] == c[v]) d.merge(u, v);
  }
  vector<char> seen(n);
  int ans = 0;
  rep(i, n) if (d.leader(i) == i) {
    ans += seen[c[i]];
    seen[c[i]] = true;
  }
  cout << ans << '\n';
}