#include <iostream>
using namespace std;
union coordinate {
int integer;
double _double;
void init() {
cin >> _double;
if ((int) _double == _double) {
integer = (int) _double;
}
}
double get() {
if (_double != NULL) return _double;
return integer;
}
};
struct coordinate_system {
coordinate x;
};
void insert(coordinate_system &point){
cout << "Input x: ";
point.x.init();
}
int main() {
struct coordinate_system point;
insert(point);
cout << "x = " << point.x.get() << ";";
}