diff --git a/code_study/Baekjoon/python/19944.py b/code_study/Baekjoon/python/19944.py
new file mode 100644
index 0000000..bc47481
--- /dev/null
+++ b/code_study/Baekjoon/python/19944.py
@@ -0,0 +1,2 @@
+N ,M = map(int, input().split())
+print("NEWBIE!" if M==1 or M==2 else "OLDBIE!" if M<=N else "TLE!")
\ No newline at end of file
diff --git a/code_study/Baekjoon/python/23027.py b/code_study/Baekjoon/python/23027.py
new file mode 100644
index 0000000..376fff6
--- /dev/null
+++ b/code_study/Baekjoon/python/23027.py
@@ -0,0 +1,18 @@
+S = input()
+
+if 'A' in S :
+    S = S.replace('B', 'A')
+    S = S.replace('C', 'A')
+    S = S.replace('D', 'A')
+    S = S.replace('F', 'A')
+elif 'B' in S :
+    S = S.replace('C', 'B')
+    S = S.replace('D', 'B')
+    S = S.replace('F', 'B')
+elif 'C' in S :
+    S = S.replace('D', 'C')
+    S = S.replace('F', 'C')
+else :
+    S = 'A'*len(S)
+
+print(S)
\ No newline at end of file
diff --git a/code_study/Baekjoon/python/3733.py b/code_study/Baekjoon/python/3733.py
new file mode 100644
index 0000000..8a3a13d
--- /dev/null
+++ b/code_study/Baekjoon/python/3733.py
@@ -0,0 +1,7 @@
+while True :
+    try :
+        n, s = map(int, input().split())
+    except :
+        break
+    
+    print(s//(n+1))
\ No newline at end of file
diff --git a/code_study/Baekjoon/python/4696.py b/code_study/Baekjoon/python/4696.py
new file mode 100644
index 0000000..45d874a
--- /dev/null
+++ b/code_study/Baekjoon/python/4696.py
@@ -0,0 +1,7 @@
+while True :
+    N = float(input())
+    if N == 0 :
+        break
+    
+    res = 1 + N * (1 + N * (1 + N * (1 + N)))
+    print(f'{res:.2f}')
\ No newline at end of file
diff --git a/code_study/Baekjoon/python/8370.py b/code_study/Baekjoon/python/8370.py
new file mode 100644
index 0000000..d7a5964
--- /dev/null
+++ b/code_study/Baekjoon/python/8370.py
@@ -0,0 +1,2 @@
+n1, k1, n2, k2 = map(int, input().split())
+print(n1*k1 + n2*k2)
\ No newline at end of file
diff --git a/code_study/Baekjoon/ts/2154.ts b/code_study/Baekjoon/ts/2154.ts
new file mode 100644
index 0000000..66af4ea
--- /dev/null
+++ b/code_study/Baekjoon/ts/2154.ts
@@ -0,0 +1,5 @@
+export {};
+const input: string = require("fs").readFileSync(0, "utf8").toString().trim();
+let str: string = "";
+for(let s=1; s<=Number(input); s++) str += s.toString();
+console.log(str.indexOf(input)+1);
\ No newline at end of file
diff --git a/code_study/Baekjoon/ts/27880.ts b/code_study/Baekjoon/ts/27880.ts
new file mode 100644
index 0000000..e633cf6
--- /dev/null
+++ b/code_study/Baekjoon/ts/27880.ts
@@ -0,0 +1,8 @@
+export {};
+const input: string[] = require("fs").readFileSync(0, "utf8").toString().trim().split('\n');
+let depth: number = 0;
+for(let line of input) {
+    const [method, num]: string[] = line.split(' ');
+    depth += (method === 'Es' ? Number(num)*21 : Number(num)*17);
+}
+console.log(depth);
\ No newline at end of file
diff --git a/code_study/Baekjoon/ts/31090.ts b/code_study/Baekjoon/ts/31090.ts
new file mode 100644
index 0000000..31d06e8
--- /dev/null
+++ b/code_study/Baekjoon/ts/31090.ts
@@ -0,0 +1,3 @@
+export {};
+const input: number[] = require("fs").readFileSync(0, "utf8").toString().trim().split('\n').map(Number);
+for(let n of input.slice(1)) console.log((n+1)%(n%100)===0 ? "Good" : "Bye");
\ No newline at end of file