#include <iostream> using namespace std; int main() { int distance; cin >> distance; // 读取路程距离 double cost = 0.0; // 打车费用 if (distance <= 2) { // 2km内起步价 cost = 6.0; } else if (distance <= 10) { // 超过2km但不超过10km cost = 6.0 + (distance - 2) * 1.8; } else { // 超过10km cost = 6.0 + 8 * 1.8 + (distance - 10) * 1.8 * 1.5; } // 输出打车费用 cout << cost << endl; return 0; }