/*
  reffered to http://kmjp.hatenablog.jp/entry/2015/01/30/0930
 */
#include <bits/stdc++.h>
#define EPS 1e-9
#define INF 1070000000LL
#define MOD 1000000007LL
#define fir first
#define foreach(it,X) for(auto it=(X).begin();it!=(X).end();it++)
#define numa(x,a) for(auto x: a)
#define ite iterator
#define mp make_pair
#define rep(i,n) rep2(i,0,n)
#define rep2(i,m,n) for(int i=m;i<(n);i++)
#define pb push_back
#define pf push_front
#define sec second
#define sz(x) ((int)(x).size())
#define ALL( c ) (c).begin(), (c).end()
#define gcd(a,b) __gcd(a,b)
#define mem(x,n) memset(x,n,sizeof(x))
#define endl "\n"
using namespace std;
template <int POS, class TUPLE> void deploy(std::ostream &os, const TUPLE &tuple){}
template <int POS, class TUPLE, class H, class ...Ts> void deploy(std::ostream &os, const TUPLE &t){ os << (POS == 0 ? "" : ", ") << get<POS>(t); deploy<POS + 1, TUPLE, Ts...>(os, t); }
template <class T,class U> std::ostream& operator<<(std::ostream &os, std::pair<T,U> &p){ os << "(" << p.first <<", " << p.second <<")";return os; }
template <class T> std::ostream& operator<<(std::ostream &os, std::vector<T> &v){ int remain = v.size(); os << "{"; for(auto e: v) os << e << (--remain == 0 ? "}" : ", "); return os; }
template <class T> std::ostream& operator<<(std::ostream &os, std::set<T> &v){ int remain = v.size(); os << "{"; for(auto e: v) os << e << (--remain == 0 ? "}" : ", "); return os; }
template <class T, class K> std::ostream& operator<<(std::ostream &os, std::map<T, K> &mp){ int remain = mp.size(); os << "{"; for(auto e: mp) os << "(" << e.first << " -> " << e.second << ")" << (--remain == 0 ? "}" : ", "); return os; }
#define DEBUG1(var0) { std::cerr << (#var0) << "=" << (var0) << endl; }
#define DEBUG2(var0, var1) { std::cerr << (#var0) << "=" << (var0) << ", ";DEBUG1(var1); }
#define DEBUG3(var0, var1, var2) { std::cerr << (#var0) << "=" << (var0) << ", ";DEBUG2(var1,var2); }
#define DEBUG4(var0, var1, var2, var3) { std::cerr << (#var0) << "=" << (var0) << ", ";DEBUG3(var1,var2,var3); }
using ll = long long;
int N;
ll memo[600][600];
ll ans = 0;

ll pow_mod(ll x,ll p,ll mod){//x^p % mod
  ll res = 1;
  while(p > 0){
    if(p & 1){
      res = (res * x) % mod;
    }
    x = (x * x) % mod;
    p >>= 1;
  }
  return res;
}


ll pascal_table[1011][1011];
void pascal_init(int n){//nCrをメモ化させる
  //memset不要
  //memset(pascal_table,0,sizeof(pascal_table));
  rep(i,n+1){
    pascal_table[i][i] = 1;
    pascal_table[i][0] = 1;
  }
  
  rep2(i,2,n+1){
    rep2(j,1,i){
      pascal_table[i][j] = pascal_table[i-1][j-1] + pascal_table[i-1][j];
      if(pascal_table[i][j] >= MOD){
	pascal_table[i][j] -= MOD;
      }
    }
  }
}

int main()
{
  cin.tie(0);
  ios_base::sync_with_stdio(0);
  pascal_init(1000);
  cin >> N;
  memo[0][0] = 1;
  for (int i = 1; i <= N; i++) {
    for (int j = 1; j <= i; j++) {
      memo[i][j] = memo[i-1][j-1] + j * memo[i-1][j];
      memo[i][j] %= MOD;
    }
  }
  for (int i = 1; i <= N; i++) {
    for (int j = 1; j <= i; j++) {
      ll ret = pascal_table[N][i];
      ret *= memo[i][j];
      ret %= MOD;
      ret *= pow_mod(j*(j-1),N-i,MOD);
      ret %= MOD;
      ans += ret;
      ans %= MOD;
      //DEBUG3(i,j,ret);
    }
  }
  cout << ans << endl;
  return 0;
}