diff --git "a/Seoyoung/BOJ_17266_\352\265\264\353\213\244\353\246\254.py" "b/Seoyoung/BOJ_17266_\352\265\264\353\213\244\353\246\254.py"
new file mode 100644
index 0000000..dbc50cf
--- /dev/null
+++ "b/Seoyoung/BOJ_17266_\352\265\264\353\213\244\353\246\254.py"
@@ -0,0 +1,45 @@
+n = int(input())
+m = int(input())
+arr = list(map(int, input().split()))
+
+if m == 1:
+    print(max(arr[0], n-arr[0]))
+else:
+    arr_gap = -1
+    # 가로등 사이의 최대간격
+    for i in range(1, m):
+        arr_gap = max(arr_gap, arr[i]-arr[i-1])
+    if(arr_gap%2 == 0):
+        arr_gap = arr_gap//2
+    else:
+        arr_gap = arr_gap//2 + 1
+    # 가로등 맨 앞,뒤로의 최대간격    
+    gap = max(arr[0], n-arr[-1])
+    # 둘 중 최댓값 출력
+    print(max(arr_gap, gap))
+    
+
+# 시간초과 코드;;; 
+
+# add = 1
+# a = False
+# result = 0
+# if m == 1:
+#     result = max(arr[0], n-arr[0])
+# else:
+#     while 1:
+#         for i in range(m-1):
+#             if(arr[i] - add) > 0: 
+#                 a = False
+#                 break
+#             if(arr[i+1] - add > arr[i] + add):
+#                 a = False
+#                 break
+#             else:
+#                 a = True
+#                 continue
+#         if a == True:
+#             result = add
+#             break
+#         add += 1
+# print(result)