diff --git a/code_study/Baekjoon/c/9527.c b/code_study/Baekjoon/c/9527.c
new file mode 100644
index 0000000..ffdc77a
--- /dev/null
+++ b/code_study/Baekjoon/c/9527.c
@@ -0,0 +1,32 @@
+#include <stdio.h>
+
+typedef long long ll;
+
+ll dp[55];
+
+ll count_one(ll N);
+
+int main() {
+    ll A, B;
+    scanf("%lld %lld",&A, &B);
+
+    for(int i=1; i<55; i++) dp[i] = 2*dp[i-1] + (1LL << (i-1));
+
+    printf("%lld\n", count_one(B) - count_one(A-1));
+
+    return 0;
+}
+
+ll count_one(ll N) {
+    ll res = 0;
+    for(int i=54; i>0; i--) {
+        ll MSB = N & (1LL <<(i-1));
+
+        if(MSB) {
+            res += dp[i-1] + (N - MSB + 1);
+            N -= MSB;
+        }
+    }
+
+    return res;
+}
\ No newline at end of file
diff --git a/code_study/Baekjoon/ts/14581.ts b/code_study/Baekjoon/ts/14581.ts
new file mode 100644
index 0000000..0a36d4b
--- /dev/null
+++ b/code_study/Baekjoon/ts/14581.ts
@@ -0,0 +1,3 @@
+export {};
+const s = require("fs").readFileSync(0).toString().trim();
+console.log(":fan::fan::fan:\n" + ":fan::" + s + "::fan:" + "\n:fan::fan::fan:\n");
\ No newline at end of file