#include <stdio.h>
#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
using namespace atcoder;
using mint = modint998244353;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000001
#define Inf64 4000000000000000001

int main(){
	
	int N,M;
	cin>>N>>M;
	
	vector<int> c(N);
	rep(i,N)cin>>c[i];
	dsu D(N);
	rep(i,M){
		int a,b;
		cin>>a>>b;
		a--,b--;
		if(c[a]!=c[b])continue;
		D.merge(a,b);
	}
	vector<int> cnt(N+5);
	rep(i,N){
		if(D.leader(i)==i)cnt[c[i]]++;
	}
	int ans = 0;
	rep(i,N+5){
		if(cnt[i]>=2)ans += cnt[i]-1;
	}
	cout<<ans<<endl;
	
	return 0;
}