/* Telebe of Adicto && Mamedov yani AzeTurk810 I see humans but no humanity */ #include <iostream> //mt19937 rng(chrono::steady_clock::now().time_since_epoch().count()); using ll = long long; using namespace std; #define ln '\n' #define INFi 1e9 #define INFll 1e18 constexpr int up = 202 , MOD = 1e9 + 7; int dp[2][up][up][up]; void solve() { int n ,cs , cf; cin >> n >> cs >> cf; dp[0][2][1][2] = 1; dp[1][2][2][1] = 1; for(int l = 3;l <= n;l++) { for(int s = 1;s <= l;s ++) { for(int f = 1;f <= l; f++) { if(s == f) continue; for(int k = s;k < l;k++) { dp[0][l][s][f] += dp[1][l - 1][k][f - (f > s)]; dp[0][l][s][f] %= MOD; } for(int k = 1;k < s;k++) { dp[1][l][s][f] += dp[0][l - 1][k][f - (f > s)]; dp[1][l][s][f] %= MOD; } } } } cout << (dp[0][n][cs][cf] + dp[1][n][cs][cf]) % MOD << ln; } // Attack on titan<3 signed main() { ios::sync_with_stdio(0); cin.tie(nullptr); int t = 1; // cin >> t; for(int cases = 0 ; cases < t;cases ++) { solve(); } } // Just Imaginary