diff --git a/zeta_python/completed/10828.py b/zeta_python/completed/10828.py
new file mode 100644
index 0000000..d25c400
--- /dev/null
+++ b/zeta_python/completed/10828.py
@@ -0,0 +1,32 @@
+import sys
+
+
+class Stack(list):
+    def push(self, *args, **kwargs):
+        self.append(args[0])
+
+    def size(self, *args, **kwargs):
+        return self.__len__()
+
+    def empty(self, *args, **kwargs):
+        return 1 if self.__len__() == 0 else 0
+
+    def top(self, *args, **kwargs):
+        return self.__getitem__(-1)
+
+    def dispatch(self, exp):
+        t = exp.strip().split()
+        try:
+            return self.__getattribute__(t[0])(*map(int, t[1:]))
+        except:
+            return -1
+
+
+if __name__ == '__main__':
+    s = Stack()
+    N = int(sys.stdin.readline())
+    for i in range(N):
+        exp = sys.stdin.readline()
+        ret = s.dispatch(exp)
+        if ret is not None:
+            print(ret)
diff --git a/zeta_python/completed/11399.py b/zeta_python/completed/11399.py
new file mode 100644
index 0000000..1bad2ec
--- /dev/null
+++ b/zeta_python/completed/11399.py
@@ -0,0 +1,12 @@
+def solve(N, P):
+    P.sort()
+    S = P[0]
+    before = P[0]
+    for p in P[1:]:
+        S += before + p
+        before += p
+    return S
+
+
+if __name__ == '__main__':
+    print(solve(int(input()), list(map(int, input().split()))))
diff --git a/zeta_python/completed/1541.py b/zeta_python/completed/1541.py
new file mode 100644
index 0000000..21765fc
--- /dev/null
+++ b/zeta_python/completed/1541.py
@@ -0,0 +1,11 @@
+def solve(exp):
+    t = exp.split("-")
+    S = 0
+    S += sum(map(int, t[0].split("+")))
+    for i in range(1, len(t)):
+        S -= sum(map(int, t[i].split("+")))
+    return S
+
+
+if __name__ == '__main__':
+    print(solve(input()))