diff --git a/code_study/Baekjoon/python/15964.py b/code_study/Baekjoon/python/15964.py
new file mode 100644
index 0000000..0ee1400
--- /dev/null
+++ b/code_study/Baekjoon/python/15964.py
@@ -0,0 +1 @@
+print((lambda x: (x[0]**2 - x[1]**2))(list(map(int, input().split()))))
\ No newline at end of file
diff --git a/code_study/Baekjoon/python/2143.py b/code_study/Baekjoon/python/2143.py
new file mode 100644
index 0000000..b8c43c1
--- /dev/null
+++ b/code_study/Baekjoon/python/2143.py
@@ -0,0 +1,50 @@
+import sys
+input = sys.stdin.readline
+
+T = int(input())
+n, A = int(input()), list(map(int, input().split()))
+m, B = int(input()), list(map(int, input().split()))
+
+sumA = []
+for i in range(n) :
+    currentSum = 0
+    for a in A[i:] :
+        currentSum += a
+        sumA.append(currentSum)
+
+sumB = []
+for i in range(m) :
+    currentSum = 0
+    for b in B[i:] :
+        currentSum += b
+        sumB.append(currentSum)
+
+sumA.sort()
+sumB.sort()
+
+L, R = 0, len(sumB) - 1
+ans = 0
+
+while L < len(sumA) and R >= 0 :
+    a, b = sumA[L], sumB[R]
+    
+    if a + b == T:
+        na = 0
+        while L < len(sumA) and a == sumA[L] :
+            L += 1
+            na += 1
+        
+        nb = 0
+        while R >= 0 and b == sumB[R] :
+            R -= 1
+            nb += 1
+        
+        ans += na*nb
+    
+    else :
+        if a + b > T :
+            R -= 1
+        else :
+            L += 1
+
+print(ans)
\ No newline at end of file
diff --git a/code_study/Baekjoon/python/2143_1.py b/code_study/Baekjoon/python/2143_1.py
new file mode 100644
index 0000000..8322802
--- /dev/null
+++ b/code_study/Baekjoon/python/2143_1.py
@@ -0,0 +1,31 @@
+from collections import Counter
+import sys
+input = sys.stdin.readline
+
+T = int(input())
+n, A = int(input()), list(map(int, input().split()))
+m, B = int(input()), list(map(int, input().split()))
+
+sumA = []
+for i in range(n) :
+    currentSum = 0
+    for a in A[i:] :
+        currentSum += a
+        sumA.append(currentSum)
+
+sumB = []
+for i in range(m) :
+    currentSum = 0
+    for b in B[i:] :
+        currentSum += b
+        sumB.append(currentSum)
+
+countA = Counter(sumA)
+countB = Counter(sumB)
+
+ans = 0
+for key in countA :
+    target = T - key
+    ans += countA[key]*countB[target]
+
+print(ans)
\ No newline at end of file