#include<bits/stdc++.h>
// #pragma GCC target ("avx,avx2,fma")
// #pragma GCC optimize("Ofast")
// #pragma GCC optimize("unroll-loops")
typedef long long ll;
typedef long double ld;
#define SPEED ios_base::sync_with_stdio(false); cin.tie(0), cout.tie(0)
#define rall(v) (v).rbegin(),(v).rend()
#define all(v) (v).begin(),(v).end()
#define OK cerr<<"OK"<<endl<<flush
#define pii pair<int, int>
#define pll pair<ll, ll>
#define pb push_back
#define F first
#define S second
#define y0 jahdakdh
#define y1 jahsadakdakdh
#define endl '\n'
const ll MOD=1e9+7;
using namespace std;
//mt19937 rng(std::chrono::system_clock::now().time_since_epoch().count());
int n, st, fin;
ll ans;
bool used[2005];
void f(int cur, int pr, int cnt)
{
if(cur==fin and cnt==n)
{
ans++; ans%=MOD;
return;
}
used[cur]=1;
for(int nxt=1; nxt<=n; nxt++)
if(!used[nxt])
{
if(pr==-1) f(nxt, cur, cnt+1);
else if(pr<cur and nxt<cur) f(nxt, cur, cnt+1);
else if(cur<pr and cur<nxt) f(nxt, cur, cnt+1);
}
used[cur]=0;
}
int main()
{
SPEED;
cin>>n>>st>>fin;
f(st, -1, 1);
cout<<ans;
return 0;
}
