#include <bits/stdc++.h>

#define fst(t) std::get<0>(t)
#define snd(t) std::get<1>(t)
#define thd(t) std::get<2>(t)
#define unless(p) if(!(p))
#define until(p) while(!(p))

using ll = std::int64_t;
using P = std::tuple<int,int>;

constexpr ll MOD = 1'000'000'007;
int N;
ll dp[556][556];

int main(){
    std::cin.tie(nullptr);
    std::ios::sync_with_stdio(false);

    std::cin >> N;

    ll c = 0;

    for(int i=1;i<=N;++i){
        std::fill(&dp[0][0], &dp[0][0] + 556 * 556, 0);
        dp[0][0] = 1;
        for(int j=1;j<=N;++j){
            dp[j][0] = dp[j-1][0] * i * (i - 1) % MOD;
            for(int k=1;k<=i;++k){
                dp[j][k] = (dp[j-1][k-1] + 1ll * (i * (i - 1) + k) % MOD * dp[j-1][k] % MOD) % MOD;
            }
        }

        c = (c + dp[N][i]) % MOD;
    }

    std::cout << c << std::endl;
}