#include <cstdio>
#include <cstring>
#include <iostream>
#include <string>
#include <cmath>
#include <bitset>
#include <vector>
#include <map>
#include <set>
#include <queue>
#include <deque>
#include <algorithm>
#include <complex>
#include <unordered_map>
#include <unordered_set>
#include <random>
using namespace std;
typedef long long int ll;
typedef pair<int, int> P;
const ll MOD=1e9+7;
int main()
{
	int n;
	cin>>n;
	ll pow[556][1111];
	for(ll i=0; i<=n; i++){
		pow[i][0]=1;
		for(int j=1; j<=2*n; j++){
			pow[i][j]=pow[i][j-1]*i%MOD;
		}
	}
	ll comb[556][556]={};
	comb[0][0]=1;
	for(int i=1; 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;
		}
	}
	ll a[556][556];
	fill(a[1]+1, a[1]+n+1, 1);
	for(ll x=2; x<=n; x++){
		a[x][x]=1;
		for(int y=x+1; y<=n; y++){
			a[x][y]=(a[x-1][y-1]+x*a[x][y-1])%MOD;
		}
	}
	ll b[556][556];
	for(int x=1; x<=n; x++){
		for(int y=x; y<=n; y++){
			b[x][y]=pow[x][n-y]*pow[x-1][n-y]%MOD*a[x][y]%MOD;
		}
	}
	ll ans=0;
	for(int x=1; x<=n; x++){
		for(int y=x; y<=n; y++){
			ans+=(comb[n][y]*b[x][y]%MOD);
			ans%=MOD;
		}
	}
	cout<<ans<<endl;
	return 0;
}