#include <iostream>
using namespace std;
int main(){
    double weight;
    std::cout << "请输入行李的重量（公斤）: ";
    std::cin >> weight;

    double fee;
    if (weight <= 10) {
        fee = 2.5;
    } else {
        fee = 2.5 + (weight - 10) * 1.5;
    }

    std::cout << "托运费为: " << fee << " 元" << std::endl;
    return 0;
}   
/**************************************************************
	Problem: 1043
	User: fandaohan
	Language: C++
	Result: Wrong Answer
****************************************************************/