#include <atcoder/dsu>
#include <iostream>
#include <ranges>
#include <set>
#include <vector>
using namespace std;

int main() {
    int N, M;
    cin >> N >> M;
    vector<int> C(N);
    for (auto& a : C) {
        cin >> a;
        a--;
    }

    atcoder::dsu dsu(N);
    for (int i = 0; i < M; ++i) {
        int u, v;
        cin >> u >> v;
        u--;
        v--;
        if (C[u] == C[v]) {
            dsu.merge(u, v);
        }
    }

    vector<set<int>> col_gr(N);

    for (int i = 0; i < N; ++i) {
        auto lea = dsu.leader(i);
        auto cur_col = C[lea];
        col_gr[cur_col].insert(lea);
    }

    using ll = long long;
    ll ans = 0;
    for (int i = 0; i < N; ++i) {
        if (!col_gr[i].empty()) {
            ans += (int)col_gr[i].size() - 1;
        }
    }
    cout << ans << endl;
}