// Wrongri-La Shower #include #include std::string M, D; int dp[205][2][2000], dp2[205][2][2000]; const int MOD = 1000000009; int rec(int digit, bool free, int rest, int (&dp)[205][2][2000], const std::string str){ if(digit == str.size()){return rest == 0;} auto &res = dp[digit][free][rest]; if(res != -1){return res;} res = 0; for(int i=0;i<=(free?9:str[digit]-'0');i++){ if(rest < i){continue;} res = (res + rec(digit+1, free | (i != str[digit]-'0'), rest - i, dp, str)) % MOD; } return res; } int main(){ std::cin >> M >> D; memset(dp, -1, sizeof(dp)); memset(dp2, -1, sizeof(dp2)); long long res = 0ll; for(int i=1;i<2000;i++){ res = (1ll * rec(0, 0, i, dp, M) * rec(0, 0, i, dp2, D) + res) % MOD; } std::cout << res << std::endl; }