---

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        <!-- 1. НАЧАЛО -->
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        <!-- 2. ВВОД x, n -->
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        <!-- 3. ПРОВЕРКА ВВОДА -->
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        <!-- ОШИБКА СПРАВА -->
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        <!-- 4. ИНИЦИАЛИЗАЦИЯ S -->
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        <!-- 5. ВНЕШНИЙ ЦИКЛ ПО k -->
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        <!-- 6. ПРОВЕРКА k = 2 -->
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        <!-- 7. ВЫЧИСЛЕНИЕ a И СБРОС P -->
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        <!-- 8. ВНУТРЕННИЙ ЦИКЛ ПО m -->
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        <!-- 9. ПРОВЕРКА m = 4 -->
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        <!-- 10. ВЫЧИСЛЕНИЕ P -->
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        <!-- 11. НАКОПЛЕНИЕ СУММЫ S -->
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        <!-- 12. ВЫВОД S -->
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        <!-- 13. КОНЕЦ -->
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        <!-- СВЯЗИ ОСНОВНОЙ ВЕРТИКАЛИ -->
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        <!-- ОШИБКА ВВОДА -->
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        <!-- ЛИНИЯ ОШИБКИ В КОНЕЦ ПО ДАЛЬНЕМУ ПРАВОМУ КРАЮ (X = 760) -->
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        <!-- ВЕТВЛЕНИЕ k = 2 -->
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        <!-- ОБХОД k = 2 (Да) -> КОРИДОР СПРАВА X = 570 В ОБХОД ВНЕШНЕГО ЦИКЛА -->
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        <!-- ОБХОД m = 4 (Да) -> КОРИДОР СПРАВА X = 530, ЗАТЕМ В ВОЗВРАТ ЦИКЛА m -->
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        <!-- ВОЗВРАТ ВО ВНЕШНИЙ ЦИКЛ k (ДАЛЬНИЙ ЛЕВЫЙ КОРИДОР X = 120) -->
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