#include <iostream>
using namespace std;
int main()
{
cout<<"Enter your income: ";
double income=0,tmp=0,tax=0;
while(cin>>income&&income>=0)
{
if(income<=5000) tax=0;
else if(income<=15000) tax=(income-5000)*0.1;
else if(income<=35000) tax=(15000-5000)*0.1+(income-15000)*0.15;
else if(income>35000) tax=(15000-5000)*0.1+(35000-15000)*0.15+(income-35000)*0.2;
cout<<"Your tax is: "<<tax<<"tvarp!"<<endl;
cout<<"Enter your income: ";
}
return 0;
}