#include <cassert>
#include <cctype>
#include <cerrno>
#include <cfloat>
#include <ciso646>
#include <climits>
#include <clocale>
#include <cmath>
#include <csetjmp>
#include <csignal>
#include <cstdarg>
#include <cstddef>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <ctime>
/*
//#if __cplusplus >= 201103L
#include <ccomplex>
#include <cfenv>
#include <cinttypes>
#include <cstdbool>
#include <cstdint>
#include <ctgmath>
#include <cwchar>
#include <cwctype>
*/

// C++
#include <algorithm>
#include <bitset>
#include <complex>
#include <deque>
#include <exception>
#include <fstream>
#include <functional>
#include <iomanip>
#include <ios>
#include <iosfwd>
#include <iostream>
#include <istream>
#include <iterator>
#include <limits>
#include <list>
#include <locale>
#include <map>
#include <memory>
#include <new>
#include <numeric>
#include <ostream>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <stdexcept>
#include <streambuf>
#include <string>
#include <typeinfo>
#include <utility>
#include <valarray>
#include <vector>
/*
//#if __cplusplus >= 201103L
#include <array>
#include <chrono>
#include <condition_variable>
#include <forward_list>
#include <future>
#include <initializer_list>
#include <mutex>
#include <random>
#include <ratio>
#include <regex>
#include <scoped_allocator>
#include <system_error>
#include <thread>
#include <tuple>
#include <typeindex>
#include <type_traits>
#include <unordered_map>
#include <unordered_set>
*/
using namespace std;
#define fi first
#define se second
#define repl(i,a,b) for(int i=(int)(a);i<(int)(b);i++)
#define rep(i,n) repl(i,0,n)
#define each(itr,v) for(auto itr:v)
#define pb(s) push_back(s)
#define mmax(x,y) (x>y?x:y)
#define mmin(x,y) (x<y?x:y)
#define maxch(x,y) x=mmax(x,y)
#define minch(x,y) x=mmin(x,y)
#define mp(a,b) make_pair(a,b)
#define all(x) (x).begin(),(x).end()
#define dbg(x) cout<<#x"="<<x<<endl

#define uni(x) x.erase(unique(all(x)),x.end())
template<class T,class U>inline void chmin(T &t,U f){if(t>f)t=f;}
template<class T,class U>inline void chmax(T &t,U f){if(t<f)t=f;}
#define MAX(a, b) ((a) > (b) ? (a) : (b))
#define MIN(a, b) ((a) > (b) ? (b) : (a))

typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> P;
typedef pair<P, int> PPI;

#define INF INT_MAX/3
#define MAX_N 1000
#define M_INF 1000000000

class UnionFind {
public:
  vector<int> par, rank, sizes; // parent, depth, size(only for root)
  UnionFind(int sz) : par(sz), rank(sz, 0), sizes(sz, 1){
    rep(i,sz) par[i]=i; // initial tree is independent each other
  }
  int find(int x){
    if(par[x]==x) return x;
    else return par[x] = find(par[x]);
  }
  void unite(int x, int y){
    x=find(x);
    y=find(y);
    if(x==y) return;  // already belong to same tree
    if(rank[x] < rank[y]){  // y becomes parent node
      par[x] = y;
      sizes[y] += sizes[x];
    } else {  // x becomes parent node
      par[y]=x;
      if(rank[x]==rank[y]) rank[x]++;
      sizes[x] += sizes[y];
    }
  }
  bool same(int x, int y){
    return find(x) == find(y);
  }
  int size(int x){
    return sizes[find(x)];
  }
}; // END class UnionFind



ll n,m;
std::vector<ll> p;
ll x,y;
void solve(){
   cin.tie(0);
  ios::sync_with_stdio(false);
  cin>>n>>m;
  p.resize(n+3);
  rep(i,n) cin>>p[i];
  UnionFind uf(n+3);
  rep(i,m) {
    cin>>x>>y;
    uf.unite(x,y);
  }
  ll cnt = 0;
  rep(i,n){
    if(uf.same(i+1,p[i]) || i+1 == p[i]) cnt++;
  }
  cout<<cnt<<endl;



}
int main(){
  solve();
  return 0;
}



Measured memory_bytes: 2176