main() {
	assert 0 | 0 == 0
	assert 0 | 1 == 1
	assert 1 | 0 == 1
	assert 1 | 1 == 1
	assert 1 | 2 == 3
	assert 1 | 3 == 3
	assert 2 | 0 == 2
	assert 2 | 1 == 3
	assert 2 | 2 == 2
	assert 2 | 3 == 3
	assert 3 | 0 == 3
	assert 3 | 1 == 3
	assert 3 | 2 == 3
	assert 3 | 3 == 3
}