#line 1 "combined.cpp"
#pragma region Macros
#include <bits/stdc++.h>
using namespace std;
template <class T> inline bool chmax(T &a, T b) {
    if(a < b) {
        a = b;
        return 1;
    }
    return 0;
}
template <class T> inline bool chmin(T &a, T b) {
    if(a > b) {
        a = b;
        return 1;
    }
    return 0;
}
#ifdef DEBUG
template <class T, class U>
ostream &operator<<(ostream &os, const pair<T, U> &p) {
    os << '(' << p.first << ',' << p.second << ')';
    return os;
}
template <class T> ostream &operator<<(ostream &os, const vector<T> &v) {
    os << '{';
    for(int i = 0; i < (int)v.size(); i++) {
        if(i) { os << ','; }
        os << v[i];
    }
    os << '}';
    return os;
}
void debugg() { cerr << endl; }
template <class T, class... Args>
void debugg(const T &x, const Args &... args) {
    cerr << " " << x;
    debugg(args...);
}
#define debug(...)                                                             \
    cerr << __LINE__ << " [" << #__VA_ARGS__ << "]: ", debugg(__VA_ARGS__)
#define dump(x) cerr << __LINE__ << " " << #x << " = " << (x) << endl
#else
#define debug(...) (void(0))
#define dump(x) (void(0))
#endif

struct Setup {
    Setup() {
        cin.tie(0);
        ios::sync_with_stdio(false);
        cout << fixed << setprecision(15);
    }
} __Setup;

using ll = long long;
#define OVERLOAD3(_1, _2, _3, name, ...) name
#define ALL(v) (v).begin(), (v).end()
#define RALL(v) (v).rbegin(), (v).rend()
#define REP1(i, n) for(int i = 0; i < int(n); i++)
#define REP2(i, a, b) for(int i = (a); i < int(b); i++)
#define REP(...) OVERLOAD3(__VA_ARGS__, REP2, REP1)(__VA_ARGS__)
#define UNIQUE(v) sort(ALL(v)), (v).erase(unique(ALL(v)), (v).end())
#define REVERSE(v) reverse(ALL(v))
#define SZ(v) ((int)(v).size())
const int INF = 1 << 30;
const ll LLINF = 1LL << 60;
constexpr int MOD = 1000000007;
constexpr int MOD2 = 998244353;
const int dx[4] = {1, 0, -1, 0};
const int dy[4] = {0, 1, 0, -1};

void Case(int i) { cout << "Case #" << i << ": "; }
int popcount(int x) { return __builtin_popcount(x); }
ll popcount(ll x) { return __builtin_popcountll(x); }
#pragma endregion Macros

#line 2 "/Users/siro53/kyo-pro/compro_library/data-structure/unionfind.hpp"

#line 7 "/Users/siro53/kyo-pro/compro_library/data-structure/unionfind.hpp"

class UnionFind {
  public:
    UnionFind() = default;
    explicit UnionFind(int n) : N(n), parent_or_size(n, -1) {}
    int leader(int u) {
        assert(0 <= u && u < N);
        if(parent_or_size[u] < 0) return u;
        return (parent_or_size[u] = leader(parent_or_size[u]));
    }
    bool same(int u, int v) { return (leader(u) == leader(v)); }
    bool merge(int u, int v) {
        u = leader(u);
        v = leader(v);
        if(u == v) return false;
        if(-parent_or_size[u] < -parent_or_size[v]) std::swap(u, v);
        parent_or_size[u] += parent_or_size[v];
        parent_or_size[v] = u;
        return true;
    }
    int size(int u) { return (-parent_or_size[leader(u)]); }
    std::vector<std::vector<int>> groups() {
        std::vector<int> leaders(N), group_size(N, 0);
        for(int i = 0; i < N; i++) {
            leaders[i] = leader(i);
            group_size[leaders[i]]++;
        }
        std::vector<std::vector<int>> g(N);
        for(int i = 0; i < N; i++) g[i].reserve(group_size[i]);
        for(int i = 0; i < N; i++) g[leaders[i]].push_back(i);
        g.erase(std::remove_if(
                    g.begin(), g.end(),
                    [&](const std::vector<int> &v) { return v.empty(); }),
                g.end());
        return g;
    }
    std::map<int, std::vector<int>> groups_with_map() {
        std::map<int, std::vector<int>> g;
        for(int i = 0; i < N; i++) {
            int l = leader(i);
            if(!g.count(l)) g[l].push_back(i);
        }
        return g;
    }

  private:
    int N;
    std::vector<int> parent_or_size;
};
#line 78 "combined.cpp"

void solve() {
    int N, M;
    cin >> N >> M;
    vector<int> C(N);
    REP(i, N) cin >> C[i], C[i]--;
    UnionFind uf(N);
    REP(i, M) {
        int u, v;
        cin >> u >> v;
        u--, v--;
        if(C[u] == C[v]) uf.merge(u, v);
    }
    vector<int> cnt(N);
    set<int> se;
    REP(i, N) {
        if(se.count(uf.leader(i))) continue;
        se.insert(uf.leader(i));
        cnt[C[uf.leader(i)]]++;
    }
    ll ans = 0;
    REP(i, N) ans += max(0, cnt[i] - 1);
    cout << ans << endl;
}

int main() {
    int T{1};
    // cin >> T;
    while(T--) solve();
}