#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
  #define _GLIBCXX_DEBUG
#else
  #define Debug(...) void(0)
#endif
using ll = long long;
#define rep(i, n) for (int i = 0; i < (n); ++i)

#include<atcoder/dsu>

int main() {
  int n,m;cin>>n>>m;
  vector<int> c(n);
  rep(i,n)cin>>c[i];
  map<int, set<int>> leads;
  rep(i, n) leads[c[i]].insert(i);
  atcoder::dsu d(n);
  rep(_, m) {
    int a, b;
    cin >> a >> b;
    --a, --b;
    if (c[a] == c[b]) {
      int la = d.leader(a);
      int lb = d.leader(b);
      if (la != lb) {
        d.merge(a, b);
        int nl = d.leader(a);
        leads[c[a]].erase(la);
        leads[c[b]].erase(lb);
        leads[c[nl]].insert(nl);
      }
    }
  }
  int ans = 0;
  for (auto [_, s] : leads) {
    ans += s.size() - 1;
  }
  cout << ans << endl;
  return 0;
}