diff --git a/assignment.html b/assignment.html
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+++ b/assignment.html
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+<!DOCTYPE html><html>
+<head>
+<title>Sample HTML page</title>
+<script src="main.js"></script>
+</head>
+<body>
+<div>
+    <!--<p>Calculating factorial number</p>
+    <input type="text" id="factorial"/>
+    <button type="button" onclick="onFactorialBtnClick();">Factorial</button>
+     <p>Find the sum of the first 500 natural numbers</p> -->
+     <input type="text" id="naturalNumber"/>
+     <button type="button" onclick="sumofNaturalNum();">submit</button>
+     <p>please check output in console</p>
+    
+</div>
+
+<div id="output">
+
+</div>
+</body>
+</html>
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diff --git a/main.js b/main.js
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+
+function factorial(number) {
+    if (number === 0) {
+      return 1;
+    }
+     return number * factorial(number - 1);
+  }
+
+  function sumofNaturalNum(){
+      /* sn = n(n+1)/2*/
+      //getting factorial number
+      
+      console.log('Factorial for the given number is '+factorial(document.getElementById("naturalNumber").value));
+
+      //calculating sum of natural number
+      var input  = document.getElementById("naturalNumber").value;
+      var sum = Number(input)*(Number(input)+1)/2;
+      console.log('Sum of the given natural number is '+sum);
+       getMultipleSum();
+       powerofTwo();
+       fizzBuzz();
+       palindrome();
+
+  }
+
+  function getMultipleSum(){
+    var input  = document.getElementById("naturalNumber").value;
+    var sum = 0;
+    for(var i =0;i<Number(input);i++) {
+        if(i%3==0 || i%5==0){
+            sum = sum+i;
+        }
+    }
+    console.log('sum of all the multiples of 3 or 5 for the number is '+sum);
+  }
+
+  function powerofTwo(){
+    var res = 0;
+    var input  = document.getElementById("naturalNumber").value;
+    for (var i=Number(input); i>=1; i--)
+    {
+       
+        if ((i & (i-1)) == 0)
+        {
+            res = i;
+            break;
+        }
+    }
+    console.log('closest power of 2 which is less than or equal to the number is '+res );
+  }
+
+  function fizzBuzz(){
+    var inputVal  = document.getElementById("naturalNumber").value;
+    var str="";
+    for (var i=1;i<=Number(inputVal);i++)
+    {
+        if(i%3==0)
+        {
+            str+=",fizz"
+        }
+        if (i%5==0)
+        {
+            str+=",buzz"
+        }
+        if (!(i%3==0||i%5==0))
+        {
+            str+=','+i;
+        }
+        
+    }
+    console.log(str);
+  }
+
+  function palindrome(){
+    var inputVal  = "sister";//document.getElementById("naturalNumber").value;
+    var stringArr = String(inputVal).split("");
+    stringArr.reverse();
+    var reverseStr="";
+    for(var i = 0;i<stringArr.length;i++){
+        reverseStr = reverseStr+stringArr[i];
+    }
+    if(reverseStr.toUpperCase() === inputVal.toUpperCase()){
+        console.log('Given string is palindrome '+ reverseStr);
+    }else{
+        console.log('Given string not a palindrome '+ reverseStr);
+    }
+  }
+  
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