#include <iostream> using namespace std; int main() { int distance; cin >> distance; double fare = 6.0; // 起步价 if (distance > 2 && distance <= 10) { fare += (distance - 2) * 1.8; } else if (distance > 10) { fare += 8 * 1.8; // 2-10km部分 fare += (distance - 10) * 1.8 * 1.5; // 超过10km部分加价50% } cout << fare << endl; return 0; }