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diff --git a/challenge-145/abigail/java/ch-1.java b/challenge-145/abigail/java/ch-1.java
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+++ b/challenge-145/abigail/java/ch-1.java
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+//
+// See ../README.md
+//
+
+//
+// Run as: ln ch-1.java ch1.java; javac ch1.java; java ch1 < input-file
+//
+
+import java.util.*;
+import java.util.ArrayList;
+
+public class ch1 {
+    public static void main (String [] args) {
+        Scanner scanner = new Scanner (System . in);
+        ArrayList <Integer> numbers = new ArrayList <Integer> ();
+        while (scanner . hasNextInt ()) {
+            numbers . add (scanner . nextInt ());
+        }
+        int size = numbers . size () / 2;
+        int sum  = 0;
+        for (int i = 0; i < size; i ++) {
+            sum += numbers . get (i) * numbers . get (size + i);
+        }
+        System . out . println (sum);
+    }
+}