#include<bits/stdc++.h>
using namespace std;
const int maxn=200+10;
int mod=1e9+7;
long long dp[maxn][maxn][maxn][2],pd[maxn][maxn];
int n,s,e;
int ww(long long a){
a%=mod;
return a;
}
void calpd(){
pd[1][1]=1;
for(int i=2;i<=n;i++){
if((i&1)==0){
for(int j=2;j<=i;j++){
pd[i][j]=pd[i][j-1]+pd[i-1][j-1];
pd[i][j]=ww(pd[i][j]);
}
}
else{
for(int j=i-1;j>=2;j--){
pd[i][j]=pd[i][j+1]+pd[i-1][j];
pd[i][j]=ww(pd[i][j]);
}
}
}
}
int main(){
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
cin>>n>>s>>e;
if(s>e){
swap(s,e);
}
calpd();
dp[0][0][0][0]=1;
for(int sum=1;sum<=n;sum++){
for(int fn=1;fn<=sum;fn++){
for(int i=sum-fn;i>=0;i--){
int j=sum-fn-i;
for(int k=0;k<2;k++){
//if(s==)
dp[fn][i][j][k]=dp[fn-1][i+1][j][k];
if(k==0){
//dp[fn][i][j][k]+=dp[j][0][i+fn-1][k];
dp[fn][i][j][k]+=pd[j+i+fn][j+1];
if(j>0){
dp[fn][i][j][k]+=dp[j-1][1][fn+i-1][k];
// if(pd[j+i+fn][j+1]+dp[j-1][1][fn+i-1][k]!=dp[j][0][i+fn-1][k]){
// cout<<"wtfa: "<<fn<<" "<<i<<" "<<j<<" "<<pd[j+i+fn][j+1]+dp[j-1][1][fn+i-1][k]<<" "<<dp[j][0][i+fn-1][k]<<"\n";
// }
}
else{
// if(pd[j+i+fn][j+1]!=dp[j][0][i+fn-1][k]){
// cout<<"wtfa: "<<fn<<" "<<i<<" "<<j<<" "<<pd[j+i+fn][j+1]<<" "<<dp[j][0][i+fn-1][k]<<"\n";
// }
}
dp[fn][i][j][k]+=dp[fn-1][i][j][k^1];
}
else{
//dp[fn][i][j][k]+=dp[fn+i-1][0][j][k^1];
dp[fn][i][j][k]+=pd[fn+i+j][fn+i];
if(fn+i>=2){
dp[fn][i][j][k]+=dp[fn+i-2][1][j][k^1];
// if(pd[fn+i+j][fn+i]+dp[fn+i-2][1][j][k^1]!=dp[fn+i-1][0][j][k^1]){
// cout<<"wtf: "<<fn<<" "<<i<<" "<<j<<" "<<pd[fn+i+j][fn+i]+dp[fn+i-2][1][j][k^1]<<" "<<dp[fn+i-1][0][j][k^1]<<"\n";
// }
}
else{
// if(pd[fn+i+j][fn+i]!=dp[fn+i-1][0][j][k^1]){
// cout<<"wtf: "<<fn<<" "<<i<<" "<<j<<" "<<pd[fn+i+j][fn+i]<<" "<<dp[fn+i-1][0][j][k^1]<<"\n";
// }
}
dp[fn][i][j][k]+=mod-dp[fn-1][i][j][k^1];
}
dp[fn][i][j][k]=ww(ww(dp[fn][i][j][k]));
// cout<<fn<<" "<<i<<" "<<j<<" "<<k<<" "<<dp[fn][i][j][k]<<'\n';
}
}
}
}
int res=ww(dp[e-s][s-1][n-e][0]+dp[e-s][s-1][n-e][1]);
s++;
res+=mod-ww(dp[e-s][s-1][n-e][0]+dp[e-s][s-1][n-e][1]);
res=ww(res);
cout<<res<<"\n";
return 0;
}
