#include <bits/stdc++.h>
using namespace std;

long long n, m = 1;
const long long M = 1e9 + 7;
long long p[556][556], c[556][556];

long long powm(long long a, long long b) {
	long long u = 1, v = a;

	while (b > 0) {
		if (b & 1)
			u = u * v % M;

		b >>= 1;
		v = v * v % M;
	}

	return u;
}

int main()
{
	cin >> n;

	c[0][0] = 1;

	for (int i = 1; i <= n; i++) {
		c[i][0] = 1;
		c[i][i] = 1;

		for (int j = 1; j < n; j++)
			c[i][j] = (c[i - 1][j - 1] + c[i - 1][j]) % M;
	}

	p[0][0] = 1;

	for (int i = 1; i <= n; i++) {
		p[i][0] = 1;
		p[i][i] = 1;

		for (long long j = 1; j < n; j++)
			p[i][j] = (p[i - 1][j - 1] + (j + 1) * p[i - 1][j]) % M;
	}

	for (long long i = 1; i < n; i++) {
		for (long long j = 0; j < n - i; j++) {
			m = (m + p[n - j - 1][i] * c[n][j] % M * powm(i * (i + 1), j) % M) % M;
		}
	}

	cout << m << endl;
}