链接：

#include
     
      using namespace std;long long n, p2, p3;int main(){    cin >> n >> p2 >> p3;    double c2 = p2 / 2.0, c3 = p3 / 3.0;    if(n == 1) cout << (long long)(p2 < p3 ? p2 : p3) << "\n";    else if(c2 <= c3){        if(n % 2 == 0){            cout << n / 2 * p2 << "\n";        }else{            long long temp = p3 - p2;            temp = temp < p2 ? temp : p2;            cout << n / 2 * p2 + temp << "\n";        }    }else {        if(n%3 == 0){            cout << n / 3 * p3 << "\n";        }else if(n % 3 == 1){            long long temp = p2;            temp = temp < p3 ? temp : p3;            temp = temp < 2 * p2 - p3 ? temp : 2 * p2 - p3;                        cout << n/3 * p3 + temp << "\n";        }else if(n % 3 == 2){            long long temp = p2;                        temp = temp < p3 ? temp : p3;                        cout << n/3 * p3 + temp << "\n";        }    }    return 0;}