diff --git a/_hyunseo/28325.py b/_hyunseo/28325.py
new file mode 100644
index 00000000..2f7be1e0
--- /dev/null
+++ b/_hyunseo/28325.py
@@ -0,0 +1,28 @@
+import sys
+input = sys.stdin.readline
+
+N = int(input())
+arr = list(map(int, input().split()))
+
+def get(num) :
+    return (num + 1) // 2
+
+cnt = 0
+answer = 0
+first = -1
+for idx, val in enumerate(arr) :
+    if val != 0 :
+        if first == -1 :
+            first = idx
+            answer += val
+            cnt = 0
+        else :
+            answer += val
+            answer += get(cnt)
+            cnt = 0
+    else :
+        
+        cnt += 1
+answer += get(cnt + first)
+
+print(answer)