diff --git a/src/main/java/ic/doc/RpnCalculatorGui.java b/src/main/java/ic/doc/RpnCalculatorGui.java
index 3ab32b6..f13e8d2 100644
--- a/src/main/java/ic/doc/RpnCalculatorGui.java
+++ b/src/main/java/ic/doc/RpnCalculatorGui.java
@@ -4,6 +4,7 @@ import javax.swing.JFrame;
 import javax.swing.JPanel;
 import javax.swing.JTextField;
 import javax.swing.JButton;
+import java.util.Map;
 import java.util.stream.IntStream;
 
 public class RpnCalculatorGui {
@@ -16,6 +17,13 @@ public class RpnCalculatorGui {
   private static final int MIN_INPUT_NUMBER = 0;
   private static final int MAX_INPUT_NUMBER = 9;
 
+  private static final Map<String, Object> operators = Map.of(
+    "+", new Object(),
+    "-", new Object(),
+    "*", new Object(),
+    "/", new Object()
+  );
+
   public static RpnCalculatorGui withDimensions(int defaultWidth, int defaultHeight) {
     return new RpnCalculatorGui(defaultWidth, defaultHeight);
   }
@@ -37,9 +45,18 @@ public class RpnCalculatorGui {
       panel.add(button);
     });
 
+    // Add buttons for each operator
+    operators.forEach((key, value) -> {
+      JButton button = new JButton(key);
+      panel.add(button);
+    });
+
     JTextField resultField = new JTextField(RESULT_FIELD_WIDTH);
     panel.add(resultField);
 
+    JButton evaluateButton = new JButton("⏎");
+    panel.add(evaluateButton);
+
     frame.add(panel);
     frame.setVisible(true);
   }