diff --git a/code_study/Baekjoon/python/9527.py b/code_study/Baekjoon/python/9527.py
new file mode 100644
index 0000000..855fa30
--- /dev/null
+++ b/code_study/Baekjoon/python/9527.py
@@ -0,0 +1,17 @@
+dp = [0] * 55
+for n in range(1,55) :
+    dp[n] = 2*dp[n-1] + (1 << (n-1))
+
+def countOne(N) :
+    ans = 0
+    for n in range(54,0,-1) :
+        MSB = N & (1 << (n-1))
+        
+        if MSB :
+            N -= MSB
+            ans += dp[n-1] + (N + 1)
+    
+    return ans
+
+A, B = map(int, input().split())
+print(countOne(B) - countOne(A-1))
\ No newline at end of file
diff --git a/code_study/Baekjoon/ts/1598.ts b/code_study/Baekjoon/ts/1598.ts
new file mode 100644
index 0000000..b943444
--- /dev/null
+++ b/code_study/Baekjoon/ts/1598.ts
@@ -0,0 +1,6 @@
+export {};
+const [A, B]: number[] = require("fs").readFileSync(0).toString().trim().split(" ").map(Number);
+console.log(
+    Math.abs(Math.floor((A-1)/4) - Math.floor((B-1)/4)) + 
+    Math.abs((A-1)%4 - (B-1)%4)
+);
\ No newline at end of file