Сор математика
1 → 2, 1 → 3, 1 → 4, 1 → 5, 1 → 6, 2 → 1, 2 → 3, 2 → 4, 2 → 5, 2 → 6, 3 → 1, 3 → 2, 3 → 4, 3 → 5, 3 → 6, 4 → 1, 4 → 2, 4 → 3, 4 → 5, 4 → 6, 5 → 1, 5 → 2, 5 → 3, 5 → 4, 5 → 6, 6 → 1, 6 → 2, 6 → 3, 6 → 4, 6 → 5. Ответ: 30.