#include <iostream>

#define NMAX 1007

using namespace std;

int n, m, a[NMAX], Ap[NMAX], d, H[NMAX], T[NMAX], Ans;

int father(int f){
    if(T[f] == f)
        return f;
    return father(T[f]);
}

void unite(int x, int y){
    if(H[x] > H[y])
        T[y] = x;
    else
        if(H[x] < H[y])
            T[x] = y;
        else{
            ++ H[x];
            T[y] = x;
        }
}

int main(){
    cin >> d >> n >> m;
    for(int i = 1; i <= n; ++i)
        cin >> a[i];
    for(int i = 1; i <= d; ++i)
        T[i] = i;
    for(int i = 1; i <= m; ++i){
        int A, B;
        cin >> A >> B;
        int Ta = father(A);
        int Tb = father(B);
        if(Ta != Tb)
            unite(Ta, Tb);
    }
    for(int i = 1; i <= n; ++i)
        Ap[father(a[i])]++;
    for(int i = 1; i <= d; ++i)
        if(Ap[i] != 0)
            ++Ans;
    cout << Ans;
    return 0;
}