diff --git a/code_study/Baekjoon/python/30804.py b/code_study/Baekjoon/python/30804.py
new file mode 100644
index 0000000..7a00af9
--- /dev/null
+++ b/code_study/Baekjoon/python/30804.py
@@ -0,0 +1,24 @@
+import sys
+input = sys.stdin.readline
+print = sys.stdout.write
+
+N = int(input())
+tanghuru = list(map(int, input().split()))
+fruit_count = {}
+start = end = 0
+maxLen = 0
+
+while True :
+    if  len(fruit_count) <= 2 :
+        maxLen = max(maxLen, end - start)
+        if end == N :
+            break
+        fruit_count[tanghuru[end]] = fruit_count.get(tanghuru[end],0) + 1
+        end += 1
+    else :
+        fruit_count[tanghuru[start]] -= 1
+        if fruit_count[tanghuru[start]] == 0 :
+            fruit_count.pop(tanghuru[start])
+        start += 1
+
+print(str(maxLen)+'\n')
\ No newline at end of file