assert 1 == 1
assert 2 != 3

assert -1 == 2 + -3
assert -8 == -(3 + 1) * 2

assert 7 == 1 + 2 * 3
assert 9 == (1 + 2) * 3

assert 8 == 2^3

assert -8 == -2^3

assert 1 == 5 % 2
assert 2 == 5 / 2
assert 3 == 6 / 2

assert 64 == 2^(3+3)

assert 1 == -2 - -3

assert 5 + 7 == 12