hi , created a list and going to add the record , but the 1st record is not getting added, only the second record is geting add, my i knw the reason behind that thanks ..

<apex:page controller="accountinsert" >
 
 
  <apex:form >
   
   <apex:pageblock >
    <apex:pageblockSection >
     
     <apex:inputField value="{!acc.name}"/>
    <apex:inputField value="{!acc.phone}"/>
    <apex:inputField value="{!acc.Rating}"/>
    <apex:inputField value="{!acc.Industry}"/>
    
    </apex:pageblockSection>
   
    <apex:pageblockButtons location="top">
    
    <apex:commandButton Value="Submit" action="{!addtolist}"  />
    
     <apex:commandButton Value="Clear" action="{!Clear}"  />
    </apex:pageblockButtons>
   
   <apex:pageblockSection columns="1" Rendered="{!lstaccount.size>0}"  >
   
     <apex:pageblockTable value="{!lstaccount}" var="a"  > 
    
     <apex:column headerValue="Name">{!a.name}</apex:column>
     
     <apex:column headerValue="Phone">{!a.Phone}</apex:column>
     
     <apex:column headerValue="Rating">{!a.Rating}</apex:column>
     
     
     <apex:column headerValue="industry">{!a.industry}</apex:column>
    </apex:pageblockTable>
    
    
   </apex:pageblockSection>
  
   
   
   
   
   </apex:pageblock>
  
  </apex:form>
</apex:page>

Controller:
 

public class accountinsert {

 public list<account> lstaccount{get;set;}
 
  public account acc{get;set;}
  
  
   public accountinsert(){
   
    lstaccount= new list<account>();
     //acc = new account();
  
   }
   
    public void addtolist(){
    
     acc = new account();
      
    lstaccount.add(acc);
    
    
    }
    
    public void Clear(){
    
    lstaccount.clear();
    
    }
}

my i know the reason, why iam not getting add, the 1st record, and other getting added,,

Thanks 
Deepika