#include <iostream>

using namespace std;

int main() {
  cin.exceptions(ios::failbit|ios::badbit);

  try {
    int n;
    cout << "n: "; cin >> n;
    cout << "n: " << n << endl;
  } catch (const ios::failure& e) {
    cerr << "I/O-exception: "
         << e.what() << endl;
  }

  return 0;
}