diff --git "a/xxubin04/Binary Search/2805_\353\202\230\353\254\264 \354\236\220\353\245\264\352\270\260.py" "b/xxubin04/Binary Search/2805_\353\202\230\353\254\264 \354\236\220\353\245\264\352\270\260.py"
new file mode 100644
index 0000000..be47f69
--- /dev/null
+++ "b/xxubin04/Binary Search/2805_\353\202\230\353\254\264 \354\236\220\353\245\264\352\270\260.py"	
@@ -0,0 +1,33 @@
+input = open(0).readline
+
+tree_num, length = map(int, input().split())
+trees = sorted(list(map(int, input().split())))
+
+def binary_search(target, trees):
+    start = 0
+    end = trees[-1]
+
+    while start <= end:
+        mid = (start + end) // 2
+        cutted_trees = 0
+
+        for i in trees:
+            if (i - mid) >= 0:
+                cutted_trees += (i - mid)
+
+        if cutted_trees == target:
+            return mid
+        elif cutted_trees > target:
+            start = mid + 1
+        else:
+            end = mid - 1
+
+    if cutted_trees >= target:
+        ans = mid
+    else:
+        ans = mid - 1
+
+    return ans
+
+
+print(binary_search(length, trees))
\ No newline at end of file
diff --git a/xxubin04/README.md b/xxubin04/README.md
index 67dbd0f..e2faadf 100644
--- a/xxubin04/README.md
+++ b/xxubin04/README.md
@@ -28,4 +28,5 @@
 | 24차시 | 2024.01.29 |  DP  | <a href="https://www.acmicpc.net/problem/1495">[1495]기타리스트</a>  | https://github.com/AlgoLeadMe/AlgoLeadMe-3/pull/86 |
 | 25차시 | 2024.02.01 |  구현  | <a href="https://leetcode.com/problems/roman-to-integer/">[13]Roman to Integer</a>  | https://github.com/AlgoLeadMe/AlgoLeadMe-3/pull/91 |
 | 26차시 | 2024.02.05 |  에라토스테네스의 체  | <a href="https://www.acmicpc.net/problem/4948">[4948]베르트랑 공준</a>  | https://github.com/AlgoLeadMe/AlgoLeadMe-3/pull/94 |
-| 27차시 | 2024.02.08 |  수학  | <a href="https://www.acmicpc.net/problem/2885">[2885]초콜릿 식사</a>  | https://github.com/AlgoLeadMe/AlgoLeadMe-3/pull/98 |
\ No newline at end of file
+| 27차시 | 2024.02.08 |  수학  | <a href="https://www.acmicpc.net/problem/2885">[2885]초콜릿 식사</a>  | https://github.com/AlgoLeadMe/AlgoLeadMe-3/pull/98 |
+| 28차시 | 2024.02.15 |  이진탐색  | <a href="https://www.acmicpc.net/problem/2805">[2805]나무 자르기</a>  | https://github.com/AlgoLeadMe/AlgoLeadMe-3/pull/108 |
\ No newline at end of file