diff --git a/UPCODER/Server thi/LTNC2024.CA1.CAU2.cpp b/UPCODER/Server thi/LTNC2024.CA1.CAU2.cpp
new file mode 100644
index 00000000..09f9c6bc
--- /dev/null
+++ b/UPCODER/Server thi/LTNC2024.CA1.CAU2.cpp	
@@ -0,0 +1,36 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+int main() {
+    freopen("botheso.inp", "r", stdin);
+    freopen("botheso.out", "w", stdout);
+    
+    int n, du = 0;
+    stack<int> s;
+    cin >> n;
+    
+    vector<int> v(n);
+    for (int &x : v) cin >> x;
+    reverse(v.begin(), v.end());
+
+    for (int x : v) {
+        x = x*2 + du;
+        du = 0;
+        
+        if (x > 9) {
+            x %= 10;
+            du = 1;
+        }
+        
+        s.push(x);
+    }
+    
+    if (du > 0) s.push(du);
+    
+    while (!s.empty()) {
+        cout << s.top() << endl;
+        s.pop();
+    }
+    
+    return 0;
+}
\ No newline at end of file