namespace Student {
	int getAge() {
	}
}

namespace Teacher {
	int getAge() {
	}
}

using namespace Student;
using namespace Teacher;

int main() {
	getAge();   // error
}

namespace Student {
	int getAge() {
	}
}

namespace Teacher {
	int getAge() {
	}
}


void func() {
	using namespace Teacher;

	getAge();
}

int main() {
	using namespace Student;
	getAge();
}