diff --git a/_hyunseo/31963.py b/_hyunseo/31963.py
new file mode 100644
index 00000000..279a469b
--- /dev/null
+++ b/_hyunseo/31963.py
@@ -0,0 +1,35 @@
+
+import sys, math
+input = sys.stdin.readline
+
+N = int(input())
+arr = list(map(int, input().split()))
+
+
+answer = 0 
+current_k = 0
+
+
+for i in range(N-1) :
+    prev = arr[i]
+    curr = arr[i + 1 ]
+    
+    if prev > curr :
+        count = 0
+        while curr < prev :
+            curr *= 2
+            count += 1
+        current_k += count
+    
+    if past <= arr[n+1] : 
+        past = arr[n+1]
+        continue
+    else :
+        count = 0
+
+        while prev * 2 <= curr :
+            prev *= 2
+            count += 1
+        current_k = max(0, current_k - count) 
+    answer += current_k
+print(answer)