#include "bits/stdc++.h"
#define fast ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define ll long long
#define pb push_back
#define in insert
#define F first
#define S second
#define vll vector<ll>
#define all(v) v.begin(),v.end()
#define endl '\n'
#define pii pair<ll,ll>
using namespace std;
const ll INF =1e18, mod = 1e9 + 7, N = 1e5 + 5;
ll gcd(ll a, ll b){
if(b == 0){
return a;
}
return gcd(b, a % b);
}
ll lcm(ll a, ll b){
return (a / gcd(a,b)) * b;
}
void solve(){
ll n,s,e;
cin >> n >> s >> e;
ll sw = 1;
sw *= (n - 2);
sw %= mod;
ll x = n - 2;
for(int i = 0; i < n - 3; i++){
x--;
sw *= x;
sw %= mod;
}
cout <<sw%mod<< endl;
}
int main(){
fast;
ll t = 1;
// cin >> t;
while(t--){
solve();
}
return 0;
}
