#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;
int cnt=0, n, start, finish, used[2005];
void f(int now, int mo, int di){
used[now]=1;
if(mo==0){
if(now==finish){
cnt++;
cnt=cnt%mod;
}
used[now]=0;
return;
}
mo--;
if(di==1){
int q=now+1;
while(q<=n){
if(used[q]==0) f(q, mo, di*-1);
q++;
}
}
else{
int q=now-1;
while(q>=1){
if(used[q]==0) f(q, mo, di*-1);
q--;
}
}
used[now]=0;
}
void solve(){
cin>>n>>start>>finish;
used[start]=1;
f(start, n-1, 1);
f(start, n-1, -1);
cout<<cnt%mod<<endl;
}
signed main(){
io;
int t=1;
//cin>>t;
while(t--){
solve();
}
}
