#include <bits/stdc++.h>
#include <sys/time.h>
using namespace std;
using i64=long long;
#define UNUSED -1
#define all(x) x.begin(),x.end()
#define pb push_back
const int mod=1e9+7,inf=1e9+1;
const i64 INF=1e18;
int add(int x,int y)
{
return (x+y)%mod;
}
void add_self(int& x,int y)
{
x+=y;
if(x>=mod)
{
x-=mod;
}
}
int prod(int x,int y)
{
return (1LL*x*y)%mod;
}
mt19937 rng(69);
const int N=100;
int dp[N][N][N][2];
int signatura(int x)
{
if(x>=0)
{
return 1;
}
return 0;
}
int main()
{
int n,start,finish;
cin>>n>>start>>finish;
dp[0][0][0][0]=dp[0][0][0][1]=1;
for(int step=1;step<n;step++)
{
for(int poz_start=0;poz_start<step;poz_start++)
{
for(int now=0;now<=step;now++)
{
int sol[2]={0,0};
for(int middle=0;middle<step;middle++)
{
add_self(sol[signatura(middle-now)] , dp[step-1][poz_start][middle][signatura(middle-now)^1]);
}
dp[step][poz_start+(now<=poz_start)][now][0]=sol[0];
dp[step][poz_start+(now<=poz_start)][now][1]=sol[1];
}
}
}
cout<<add(dp[n-1][start-1][finish-1][0],dp[n-1][start-1][finish-1][1]);
}
