import java.util.ArrayList;
import java.util.Iterator;

public class Jan22
{
    public static int sum( ArrayList<Integer> arr )
    {
        int total = 0;
        /*
        Iterator<Integer> itr = arr.iterator( );
        
        while( itr.hasNext( ) )
            total += itr.next( );
            */
        
        for( int x : arr )
            total += x;
        
        return total;
    }
    
    public static void main( String [ ] args )
    {
        ArrayList<Integer> arr = new ArrayList<Integer>( );
        for( int i = 0; i < 5; i++ )
            arr.add( i * i );
        
        System.out.println( sum( arr ) );  // 0^2 + 1^2 + 2^2 + 3^2 + 4^2 = 30
    }
    
}