#include <bits/stdc++.h>

using namespace std;

const long long MOD = 1e9 + 7;
long long f[600][600];
long long comb[600][600];

long long modpow(long long x, long long p, long long mod) {
  long long ret = 1;
  while (p) {
    if (p & 1)
      ret = ret * x % mod;
    x = x * x % mod;
    p >>= 1;
  }
  return ret;
}

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);

  int n;
  cin >> n;

  for (int x = 0; x <= n; x++) {
    for (int y = 0; y <= n; y++) {
      if (x + y == 0) f[x][y] = 1;
      else if (y > x) f[x][y] = 0;
      else f[x][y] = (f[x-1][y-1] + y * f[x-1][y]) % MOD;
    }
  }

  for (int i = 0; i <= n; i++) {
    comb[i][0] = comb[i][i] = 1;
    for (int j = 1; j < i; j++)
      comb[i][j] = (comb[i-1][j-1] + comb[i-1][j]) % MOD;
  }

  long long ret = 0;
  for (int x = 1; x <= n; x++) {
    for (int y = 1; y <= x; y++) {
      long long tmp = comb[n][x] * f[x][y] % MOD * modpow(y * (y - 1) % MOD, n - x, MOD) % MOD;
      ret += tmp;
      ret %= MOD;
    }
  }
  cout << ret << endl;
  
  return 0;
}