diff --git a/index.js b/index.js
index 0f4b28b..0004e3d 100644
--- a/index.js
+++ b/index.js
@@ -1,17 +1,60 @@
 class SortedList {
+  class SortedList {
   constructor() {}
+  constructor() {
+    this.items = [] // array
+    this.length = 0; // no. of elements in array.
+  }
 
   add(item) {}
+  add(item) {
+    this.items.push(item)
+    this.items.sort((a,b)=>a-b);
+    this.length = this.items.length;
+  }
 
   get(pos) {}
+  get(pos) {
+    if(pos<0 || pos>=this.length){
+      throw new Error("OutOfBounds")
+    }
+    return this.items[pos]
+  }
 
   max() {}
+  max() {
+    if(this.length===0){
+      throw new Error("EmptySortedList")
+    }
+    return this.items[this.length-1]
+  }
 
   min() {}
+  min() {
+    if(this.length===0){
+      throw new Error("EmptySortedList")
+    }
+    return this.items[0]
+  }
 
   sum() {}
+  sum() {
+    return this.items.reduce((acc,curr)=>acc+curr,0)
+  }
 
   avg() {}
 }
+  avg() {
+    if(this.length===0){
+      throw new Error('EmptySortedList')
+    }
+    return this.sum()/this.length
+  }
+  }
+
+module.exports = SortedList;
+
+module.exports = SortedList;
+
 
 module.exports = SortedList;