diff --git a/lalalal.py b/lalalal.py
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--- /dev/null
+++ b/lalalal.py
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+def find_speed_for_eat_bananas(piles, hours):
+    """
+    solves task from README.md
+
+    :param piles: array of bananas
+    :param hours: the time during which the monkey must eat all the bananas
+    :return: a value that satisfies the condition
+
+    >>> find_speed_for_eat_bananas([3, 6, 7, 11], 8)
+    4
+    >>> find_speed_for_eat_bananas([30, 11, 23, 4, 20], 5)
+    30
+    >>> find_speed_for_eat_bananas([30, 11, 23, 4, 20], 6)
+    23
+    >>> find_speed_for_eat_bananas([4,9,28,43],7)
+    15
+    """
+    all_bananas = max_speed = 0
+    for count_of_pile in piles:
+        all_bananas += count_of_pile
+        if max_speed < count_of_pile:
+            max_speed = count_of_pile
+    min_speed = all_bananas // hours
+
+    if len(piles) == hours:
+        return max_speed
+    return search_by_binary_tree(min_speed, max_speed, piles, hours)
+
+
+def search_by_binary_tree(min_bananas, max_bananas, piles, hours):
+    """
+    :param min_bananas: minimal value to start search
+    :param max_bananas: maximal value of bananas in piles
+    :param piles: array of piles with bananas
+    :param hours: hours monkey has to eat all bananas
+    :return: minimal most suitable value to pass task condition
+
+    >>> search_by_binary_tree(1, 30, [30, 11, 23, 4, 20], 6)
+    23
+    """
+    while min_bananas < max_bananas:
+        middle = (min_bananas + max_bananas) // 2
+
+        if jackie_can_eat(piles, hours, middle):
+            max_bananas = middle
+        else:
+            min_bananas = middle + 1
+    return min_bananas
+
+
+def jackie_can_eat(piles, hours_to_eat, middle):
+    """
+    checks condition if monkey can eat all bananas with eating speed of probable_speed in hours_to_eat
+
+    :param piles: list of piles with bananas
+    :param hours_to_eat: hours monkey has to eat all bananas
+    :param middle: speed to check
+    :return: true if pass condition else false
+
+    >>> jackie_can_eat([3, 6, 7, 11], 8, 6)
+    True
+    >>> jackie_can_eat([3, 6, 7, 11], 8, 3)
+    False
+    """
+    all_hours = 0
+    for count_of_pile in piles:
+        all_hours += count_of_pile // middle
+        if count_of_pile % middle != 0:
+            all_hours += 1
+    return all_hours <= hours_to_eat
+
+
+if __name__ == '__main__':
+    import doctest
+    doctest.testmod(verbose=True)