#include <bits/stdc++.h>
using namespace std;
#define endl '\n'
#define pb push_back
#define F first
#define S second
#define ll long long
#define int ll
#define pii pair<int, int>
#define io ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define M_PI 3.14159265358979323846
#define all(v) v.begin(), v.end()
#define pss pair<string, string>
#define no cout<<"No"<<endl;
#define yes cout<<"Yes"<<endl;
#define imp cout<<-1<<endl;
#define flu cout.flush();
#define Endl endl
const int N = 100009;
const int mod = 1e9+7;
void solve(){
int n, start, finish;
cin>>n>>start>>finish;
int dp[2005][3];
int boyuk=0, kicik=0;
if(finish<start){
swap(finish, start);
}
kicik=start-1;
boyuk=n-start-1;
dp[1][0]=1;
dp[1][1]=1;
int q=0;
for(int i=2; i<=n; i++){
dp[i][0]=(dp[i-1][1]*(max(0ll, kicik-q)))%mod;
dp[i][1]=(dp[i-1][0]*(max(0ll, boyuk-q)))%mod;
//cout<<dp[i][0]<<" "<<dp[i][1]<<endl;
q+=(i%2);
}
cout<<(dp[n-1][0]+dp[n-1][1])%mod;
}
signed main(){
io;
int t=1;
//cin>>t;
while(t--){
solve();
}
}
