#include <bits/stdc++.h>
using namespace std;

#define rep(i, n) for( ll i = 0; i < n; i++ )
using ll = long long;
struct UnionFind {
  vector<int> data;
  UnionFind(int size) : data(size, -1) { }
  bool unionSet(int x, int y) {
    x = root(x); y = root(y);
    if (x != y) {
      if (data[y] < data[x]) swap(x, y);
      data[x] += data[y]; data[y] = x;
    }
    return x != y;
  }
  bool findSet(int x, int y) {
    return root(x) == root(y);
  }
  int root(int x) {
    return data[x] < 0 ? x : data[x] = root(data[x]);
  }
  int size(int x) {
    return -data[root(x)];
  }
};

int main() {
	int N, M;
	cin >> N >> M;
	vector<int> c( N );
	vector<vector<int>> vc( N );
	rep(i, N) {
		cin >> c[i];
		c[i]--;
		vc[c[i]].push_back( i );
	}
	UnionFind uf( N );
	rep(i, M) {
		int a, b;
		cin >> a >> b;
		a--;
		b--;
		if(c[a] == c[b]) uf.unionSet(a, b);
	}
	int ans = 0;
	rep(i, N) {
		if(vc[i].size() < 2) continue;
		for( int e : vc[i] ) {
			if(uf.findSet(vc[i][0], e)) continue;
			ans++;
			uf.unionSet(vc[i][0], e);
		}
	}
	cout << ans << endl;
}