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diff --git a/entries/jyoo980/aspectj/Fibonacci.aj b/entries/jyoo980/aspectj/Fibonacci.aj
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+public aspect Fibonnacci {
+
+    pointcut mainInvocation(): call(* Main.*(*));
+
+    void before(): mainInvocation() {
+        // Nice
+        int n = 69;
+        System.out.println("The 69th fibonacci number is: " + fibonacci(n));
+    }
+
+    public int fibonacci(int n) {
+        int prev = 0;
+        int curr = 1;
+        for (int i = 0; i < n; i++) {
+            int tmp = prev;
+            prev = curr;
+            curr = prev + tmp;
+        }
+        return prev;
+    }
+}