#include <iostream>

using std::cout;
using std::cin;
using std::endl;

int main() 
{
int AmountofIncome; 
int taxrate = 0;
  
cout << "Введите размер дохода: ";
cin >> AmountofIncome;

if (AmountofIncome > 50000) {
  taxrate += (AmountofIncome - 50000) * 30 / 100;
  AmountofIncome = 50000;
  } 
  if (AmountofIncome > 10000) {
  taxrate += (AmountofIncome - 10000) * 20 / 100;
  AmountofIncome = 10000;
  }
  taxrate += AmountofIncome * 13 / 100;

  cout << "Размер налога будет составлять " << taxrate << " рублей" << endl;
}