#include <vector>
#include <iostream>
#include <cmath>
#include <map>
#include <algorithm>
#include <fstream>
#include <unistd.h>
#include <string>
#include <numeric>
#include <queue>
#include <deque>
#include <sstream>
#include <iomanip>
using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<vi> vvi;
typedef vector<vvi> vvvi;
typedef vector<bool> vb;
typedef vector<vector<bool>> vvb;
typedef vector<string> vs;
typedef vector<vector<string>> vvs;
typedef vector<char> vc;
typedef vector<vector<char>> vvc;
typedef pair<int, int> P;
typedef pair<ll, ll> PL;
typedef vector<P> vp;
typedef vector<PL> vpl;
typedef vector<vector<P>> vvp;
typedef vector<vector<PL>> vvpl;
const int INF = 1001001001;
const ll LINF = 1e18;
const double pi = 3.1415926535897932;
const string endstr = "\n";
#define FOR(i, a, b) for(ll i = (a); i < b; i++)
#define REP(i, n) for(ll i = 0; i < n; i++)
#define FORMAP(it, m) for(auto it = m.begin(); it != m.end(); it++)
#define ff first
#define ss second
#define pb push_back

template <typename T>
T gcd(T a, T b) {
    return (a == 0) ? b : gcd(b%a, a);
}
template <typename T>
T lcm(T a, T b) {
    return a / gcd(a, b) * b;
}

bool p_comp_fs(const PL p1, const PL p2){ return p1.first < p2.first;};
bool p_comp_fg(const PL p1, const PL p2){ return p1.first > p2.first;};
bool p_comp_ss(const PL p1, const PL p2){ return p1.second < p2.second;};
bool p_comp_sg(const PL p1, const PL p2){ return p1.second > p2.second;};
template <typename T>
vector<T> uniquen(vector<T> vec){
    vec.erase(unique(vec.begin(), vec.end()), vec.end());
    return vec;
}

struct UnionFind{
    vl par;
    vl rank;
    map<ll, ll> size;
    UnionFind(ll N) : par(N, 0), rank(N, 0){
        for(int i = 0; i < N; i++){
            par[i] = i; size[i] = 1;
        }
    }
    
    ll root(ll x){
        if(par[x] == x) return x;
        else{
            par[x] = root(par[x]); // compression
            return par[x];
        }
    }
    
    void unite(ll x, ll y){
        ll rx = root(x); ll ry = root(y);
        if(rx == ry) return;
        if(rank[rx] < rank[ry]) swap(rx, ry);
        if(rank[rx] == rank[ry]) ++rank[rx];
        par[ry] = rx;
//        if(rx != ry) size[rx] = size[rx] + size[ry];
//        else{
//            size[rx] = max(size[rx], size[ry]);
//        }
    }
    
    ll get_size(ll x){
        return size[root(x)];
    }
    
    bool same(ll x, ll y){
        return root(x) == root(y);
    }
};


int main(){
    ll N, M; cin >> N >> M;
    auto uf = new UnionFind(N);
    vl ps(N, 0); REP(i, N){ ll p; cin >> p; ps[i] = p-1;};
    REP(i, M){
        ll x, y; cin >> x >> y;
        uf->unite(x-1, y-1);
    }
    map<ll, vl> m1, m2;
    REP(i, N){
        ll root = uf->root(ps[i]);
        if(m1[root].size() == 0) m1[root].reserve(1024);
        if(m2[root].size() == 0) m2[root].reserve(1024);
        m1[root].pb(i);
        m2[root].pb(ps[i]);
    }
    
    ll ret = 0;
    for(auto it : m2){
        auto key = it.ff;
        auto target = m1[key];
        for(auto v : it.ss){
            auto found = binary_search(target.begin(), target.end(), v);
            if(found) ret++;
        }
    }
    cout << ret << endstr;
    return 0;
}


Measured memory_bytes: 833792