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

#ifdef LOCAL
#include <debug.hpp>
#else
#define debug(...)
#endif

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(20);
    int N, M;
    cin >> N >> M;
    vector<int> C(N);
    for (int i = 0; i < N; i++) cin >> C[i], C[i]--;
    vector<vector<int>> G(N);
    for (int i = 0; i < M; i++) {
        int u, v;
        cin >> u >> v, u--, v--;
        G[u].emplace_back(v);
        G[v].emplace_back(u);
    }

    queue<int> que;
    vector<int> cnt(N), seen(N);
    for (int i = 0; i < N; i++) {
        if (seen[i]) continue;
        cnt[C[i]]++;
        que.emplace(i);
        while (!que.empty()) {
            int v = que.front();
            que.pop();
            for (int u : G[v]) {
                if (C[v] != C[u] || seen[u]) continue;
                seen[u] = true;
                que.emplace(u);
            }
        }
    }

    int ans = 0;
    for (int c = 0; c < N; c++) {
        if (cnt[c] == 0) continue;
        ans += cnt[c] - 1;
    }

    cout << ans << '\n';
}