diff --git a/five.go b/five.go
index 7354450..fe8ac5f 100644
--- a/five.go
+++ b/five.go
@@ -3,6 +3,7 @@ package main
 import (
 	"fmt"
 	"io/ioutil"
+	"sort"
 	"strings"
 )
 
@@ -18,6 +19,7 @@ func main() {
 	d, _ := ioutil.ReadFile("in5.txt")
 	s := strings.Split(string(d), "\n")
 	max := 0
+	var ids []int
 	for _, code := range s {
 		rowUpper := 127
 		rowLower := 0
@@ -55,9 +57,18 @@ func main() {
 			}
 		}
 		id := row*8 + col
+		ids = append(ids, id)
 		if id > max {
 			max = id
 		}
 	}
-	fmt.Println(max)
+	sort.Ints(ids)
+	fmt.Println("Highest ID: ", max)
+	prev := 0
+	for _, d := range ids {
+		if prev != 0 && prev+1 != d {
+			fmt.Println("Missing Seat: ", d-1)
+		}
+		prev = d
+	}
 }