diff --git a/CodeForces/1604/D/D.cpp b/CodeForces/1604/D/D.cpp
new file mode 100644
index 00000000..b923b101
--- /dev/null
+++ b/CodeForces/1604/D/D.cpp
@@ -0,0 +1,20 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int t, x, y;
+
+int main() {
+    cin >> t;
+    while (t--) {
+        cin >> x >> y;
+        if (x > y) {
+            cout << x + y << endl;
+        } else if (x == y) {
+            cout << x << endl;
+        } else {
+            cout << y - (y % x / 2) << endl;
+        }
+    }
+    return 0;
+}