#include <bits/stdc++.h>

using namespace std;
using ll = long long;

struct UnionFind {
    int ngroup, N;
    vector<int> par, siz;

    UnionFind(int _N) : N(_N), par(_N), siz(_N){
        ngroup = _N;
        for(int i = 0; i < N; i++) par[i] = i, siz[i] = 1;
    }

    int root(int x) {
        if (par[x] == x) return x;
        return par[x] = root(par[x]);
    }

    int unite(int x, int y) {
        int rx = root(x), ry = root(y);
        if (rx == ry) return rx;
        ngroup--;
        if (siz[rx] > siz[ry]) swap(rx, ry);
        par[rx] = ry; siz[ry] += siz[rx];
        return ry;
    }

    bool same(int x, int y) {
        int rx = root(x), ry = root(y);
        return rx == ry;
    }

    int size(int x) {return siz[root(x)];}
    int group_count() {return ngroup;}

    vector<vector<int>> groups(){
        vector<int> rev(N); int nrt=0;
        for (int i=0; i<N; i++) if (root(i) == i) rev[i] = nrt, nrt++;
        vector<vector<int>> res(nrt);
        for (int i=0; i<N; i++) res[rev[root(i)]].push_back(i);

        return res;
    }
};

int main(){
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);

    ll N, M, ans=0, a, b;
    cin >> N >> M;
    vector<int> C(N), cnt(N+1);
    for (int i=0; i<N; i++) cin >> C[i];
    UnionFind tree(N);
    for (int i=0; i<M; i++){
        cin >> a >> b; a--; b--;
        if (C[a] == C[b]) tree.unite(a, b);
    }

    for (int i=0; i<N; i++){
        if (tree.root(i) == i) cnt[C[i]]++;
    }
    for (int i=1; i<=N; i++) ans += max(0, cnt[i]-1);
    cout << ans << endl;

    return 0;
}