#include <iostream>
using namespace std;
typedef struct
{
    char tensach[50];
    char tacgia[30];
    union {
        float USD;
        long VND;
    } gia;
    //int VND; //=1 VND,#1 USD
    float giamgia;
} sach;
sach s;
float thanhtien;

void thongtinsach(sach s){
    cout << "Ten sach: " << s.tensach << endl;
    cout << "Ten tac gia: " << s.tacgia << endl;

    s.giamgia = float(0.3 * s.gia.VND);
    thanhtien = s.gia.VND - s.giamgia;

    if (thanhtien == 1)
        cout << "Thanh tien: " << thanhtien << " VND" << endl;
    else
        cout << "Thanh tien: " << thanhtien/20.5 << " USD" << endl;
}

int main(){
    cout << "Nhap ten sach: " << endl;
    cin.getline(s.tensach, 50);
    cout << "nhap ten tac gia: " << endl;
    cin.getline(s.tacgia, 30);
    cout << "Nhap gia sach: " << endl;
    cin >> s.gia.VND;
    thongtinsach(s);
    return 0;
}