diff --git a/05_sumAll/sumAll.js b/05_sumAll/sumAll.js
index 00880c7..86c34bd 100644
--- a/05_sumAll/sumAll.js
+++ b/05_sumAll/sumAll.js
@@ -1,6 +1,24 @@
-const sumAll = function() {
+const sumAll = function(highInteger, lowInteger) {
+    if (!Number.isInteger(lowInteger) || !Number.isInteger(highInteger))return "ERROR";
+    if (lowInteger < 0 || highInteger < 0) return "ERROR";
+    if (lowInteger > highInteger){
+        const temp_holder = lowInteger;
+        lowInteger = highInteger;
+        highInteger = temp_holder
+    }
 
+    let finalSum = 0;
+    for (let integers = lowInteger; integers <= highInteger; integers++){
+        finalSum += integers;
+    }
+    return finalSum;
+    
 };
-
+sumAll(1, 4) 
+sumAll(1, 4000)
+sumAll(123, 1)
+sumAll(-10, 4)
+sumAll(10, "90")
+sumAll(10, [90, 1])
 // Do not edit below this line
 module.exports = sumAll;