#line 2 "../../library/template.hpp"
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pl = pair<ll, ll>;
using vl = vector<ll>;
#define rep(i, n) for(ll i = 0; i < (ll)n; i++)
#define rep3(i, l, r) for(ll i = l; i < (ll)r; i++)
#define per(i, n) for(ll i = (ll)n-1; i >= 0; i--)
#define per3(i, l, r) for(ll i = (ll)r-1; i >= (ll)l; i--)
#define all(v) begin(v), end(v)
template<class T, class U> inline void cmax(T& a, U b) { if (a < b) a = b; }
template<class T, class U> inline void cmin(T& a, U b) { if (a > b) a = b; }
constexpr char el = '\n';
template<class T, class U> ostream &operator<<(ostream &os, const pair<T, U>& p) { os << p.first << " " << p.second; return os; }
template<class T, class U> istream &operator>>(istream &is, pair<T, U> &p) { is >> p.first >> p.second; return is; }
template<class T> ostream &operator<<(ostream &os, const vector< T > &v) { rep(i, v.size()) os << v[i] << (i + 1 != v.size() ? " " : ""); return os; }
template<class T> istream &operator>>(istream &is, vector< T > &v) { for(T &in : v) is >> in; return is; }
struct IoSetup {
  IoSetup() { cin.tie(nullptr); ios::sync_with_stdio(false); cout << fixed << setprecision(15); cerr << fixed << setprecision(15); }
} io_setup;
#line 3 "../../library/union_find.hpp"

struct UnionFind {
  struct Node {
    ll parent;
    ll size;
  };
  vector<Node> tree;

  UnionFind(ll size) : tree(size) {
    rep(i, size) {
      tree[i].parent = i;
      tree[i].size = 1;
    }
  }

  ll find(ll x) {
    while (tree[x].parent != x) {
      ll p = tree[x].parent;
      tree[x].parent = tree[p].parent;
      x = p;
    }
    return x;
  }

  void unite(ll x, ll y) {
    x = find(x);
    y = find(y);
    if (x == y) return;

    if (tree[x].size < tree[y].size) swap(x, y);
    tree[y].parent = x;
    tree[x].size += tree[y].size;
  }

  bool same(ll x, ll y) {
    return find(x) == find(y);
  }
};
#line 3 "../../library/debug.hpp"

// https://codeforces.com/blog/entry/68809
void debug_print(int x) {cerr << x;}
void debug_print(long x) {cerr << x;}
void debug_print(long long x) {cerr << x;}
void debug_print(unsigned x) {cerr << x;}
void debug_print(unsigned long x) {cerr << x;}
void debug_print(unsigned long long x) {cerr << x;}
void debug_print(float x) {cerr << x;}
void debug_print(double x) {cerr << x;}
void debug_print(long double x) {cerr << x;}
void debug_print(char x) {cerr << '\'' << x << '\'';}
void debug_print(const char *x) {cerr << '\"' << x << '\"';}
void debug_print(const string &x) {cerr << '\"' << x << '\"';}
void debug_print(bool x) {cerr << (x ? "true" : "false");}
template<typename T, typename V> void debug_print(const pair<T, V> &x) {cerr << '{'; debug_print(x.first); cerr << ','; debug_print(x.second); cerr << '}';}
template<typename T> void debug_print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), debug_print(i); cerr << "}";}

void debug_print_() {cerr << "]\n";}
template <typename T, typename... V>
void debug_print_(T t, V... v) {debug_print(t); if (sizeof...(v)) cerr << ", "; debug_print_(v...);}

#ifdef LOCAL
#define debug(x...) cerr << "[" << #x << "] = ["; debug_print_(x)
#else
#define debug(x...)
#endif
#line 4 "d2.cpp"

int main() {
  ll n, m;
  cin >> n >> m;
  vl p(n);
  vector<pl> l(m);
  cin >> p >> l;

  UnionFind u(n+1);

  ll x, y;
  for (auto&& i : l) {
    tie(x, y) = i;
    u.unite(x, y);
  }

  ll ans = 0;
  rep(i, n)
    ans += u.same(i+1, p[i]);

  cout << ans << el;
}


Measured memory_bytes: 4224