#include <bits/stdc++.h>   using namespace std;   template <typename P, typename Q>   ostream& operator<<(ostream& os, pair<P, Q> p) {     os <<  (  << p.first <<  ,  << p.second <<  ) ;     return os;   }   template <typename P, typename Q>   istream& operator>>(istream& is, pair<P, Q>& p) {     is >> p.first >> p.second;     return is;   }   template <typename T>   ostream& operator<<(ostream& os, vector<T> v) {     os <<  ( ;     for (auto& i : v) os << i <<  , ;     os <<  ) ;     return os;   }   template <typename T>   istream& operator>>(istream& is, vector<T>& v) {     for (auto& i : v) is >> i;     return is;   }   template <typename T>   ostream& operator<<(ostream& os, set<T> s) {     os <<  #{ ;     for (auto& i : s) os << i <<  , ;     os <<  } ;     return os;   }   template <typename K, typename V>   ostream& operator<<(ostream& os, map<K, V> m) {     os <<  { ;     for (auto& i : m) os << i <<  , ;     os <<  } ;     return os;   }   template <typename T>   inline T setmax(T& a, T b) {     return a = std::max(a, b);   }   template <typename T>   inline T setmin(T& a, T b) {     return a = std::min(a, b);   }   template <typename P, typename Q>   inline pair<Q, P> reverse(pair<P, Q> p) {     return make_pair(p.second, p.first);   }   using lli = long long int;   using ull = unsigned long long;   using point = complex<double>;   using str = string;   template <typename T>   using vec = vector<T>;   constexpr lli mod = 1e9 + 7;   template <typename T>   struct SegTree {     int n;     vector<T> dat;     using F = function<T(T, T)>;     F fn;     T e;     SegTree(int n_, T e_, F fn_) {       e = e_;       fn = fn_;       n = 1;       while (n < n_) n *= 2;       dat.resize(2 * n - 1, e);     }     void update(size_t k, T a) {       k += n - 1;       dat[k] = a;       while (k > 0) {         k = (k - 1) / 2;         dat[k] = fn(dat[k * 2 + 1], dat[k * 2 + 2]);       }       return;     }     T query(size_t a, size_t b) { return query(a, b, 0, 0, n); }     T query(size_t a, size_t b, size_t k, size_t l, size_t r) {       if (r <= a || b <= l) return e;       if (a <= l && r <= b) return dat.at(k);       T vl = query(a, b, k * 2 + 1, l, (l + r) / 2);       T vr = query(a, b, k * 2 + 2, (l + r) / 2, r);       return fn(vl, vr);     }   };   int main(int argc, char* argv[]) {     ios_base::sync_with_stdio(0);     cin.tie(0);     int n, m, k;     while (cin >> n >> m >> k) {       vector<int> a(k);       cin >> a;       for (auto& i : a) --i;       const int N = 2 * 1e5 + 5;       vector<int> g[N];       for (int i = 0; i < m; ++i) {         int x, y;         cin >> x >> y;         --x;         --y;         g[x].push_back(y);         g[y].push_back(x);       }       const int inf = 1 << 29;       auto bfs = [&](int src) {         vector<int> cost(n, inf);         queue<int> q;         cost[src] = 0;         for (q.push(src); q.size(); q.pop()) {           int curr = q.front();           for (auto& next : g[curr]) {             if (cost[next] == inf) {               cost[next] = cost[curr] + 1;               q.push(next);             }           }         }         return cost;       };       vector<int> d1 = bfs(0);       vector<int> d2 = bfs(n - 1);       sort(a.begin(), a.end(), [&](int i, int j) { return d1[i] < d1[j]; });       SegTree<int> rmq(a.size(), -(1 << 29),                        [](int a, int b) { return max(a, b); });       for (int i = 0; i < a.size(); ++i) {         rmq.update(i, d2[a[i]]);       }       int mx = 0;       for (int i = 0; i < a.size(); ++i) {         int x = rmq.query(i + 1, a.size());         setmax(mx, d1[a[i]] + x + 1);       }       cout << min(mx, d1[n - 1]) << endl;     }     return 0;   }