diff --git a/02dec/checksum.go b/02dec/checksum.go
index 4fa697a..62a54cd 100644
--- a/02dec/checksum.go
+++ b/02dec/checksum.go
@@ -3,14 +3,14 @@ package main
 import (
 	"bufio"
 	"fmt"
+	"math"
 	"os"
 	"strconv"
 	"strings"
 )
 
-var sum int
-
 func main() {
+	var sum int
 	in := bufio.NewScanner(os.Stdin)
 	for in.Scan() {
 		sum += diff(in.Text())
@@ -19,19 +19,14 @@ func main() {
 }
 
 func diff(l string) int {
-	var min, max int
-	for n, s := range strings.Split(l, "\t") {
+	min, max := math.MaxInt64, 0
+	for _, s := range strings.Split(l, "\t") {
 		i, _ := strconv.Atoi(s)
-		if n == 0 {
+		if min >= i {
 			min = i
+		}
+		if max <= i {
 			max = i
-		} else {
-			if min > i {
-				min = i
-			}
-			if max < i {
-				max = i
-			}
 		}
 	}
 	return max - min