⊦ n ≠ 0 → m % n = m - m / n * n
n0 + n1 - (n0 + n1) / n * n = 0, n0 + n1 < 2 * n, n < n0 + n1 ⊦ n0 + n1 = n, n = 1, n = 0
Used terms: n, n0 + n1