Universe Queen

public class Euler5 
{
	public static void main(String[] args) 
	{	
		int result = 1;
 
		while( true )
		{
			boolean b = true;
 
			for( int i=1; i<=20; i++ )
			{
				if( result%i != 0 )
				{
					b = false;
					break;
				}
			}
 
			if(b)
			{
				break;
			}
 
			result++;
		}
 
		System.out.println( result );
	}
}

public class Euler4 
{
	public static boolean isPalindrome( Integer number )
	{
		String s = number.toString();
 
		for( int i=0; i<s.length()/2; i++ )
		{
			if( s.charAt(i) != s.charAt(s.length()-i-1) )
			{
				return false;
			}
		}
 
		return true;
	}
 
	public static void main(String[] args) 
	{	
		int result = 0;
 
		for( int i=100; i<1000; i++ )
		{
			for( int j=100; j<1000; j++ )
			{
				if( isPalindrome(i*j) && (i*j>result) )
				{
					result = i*j;
				}
			}
		}
 
		System.out.println( result );
	}
}

public class Euler3 
{
	public static boolean isPrime( long number )
	{
		if( number < 2 )
		{
			return false;
		}
		else if ( number == 2 )
		{
			return true;
		}
		else
		{
			for( long i=2; i<=Math.sqrt(number); i++ )
			{
				if( number%i == 0 )
				{
					return false;
				}
			}
		}
 
		return true;
	}
 
	public static void main(String[] args) 
	{	
		long result = 0;
 
		for( long i=2; i<Math.sqrt(600851475143l); i++ )
		{
			if( isPrime(i) )
			{
				if( 600851475143l%i == 0 )
				{
					result = i;
				}
			}	
		}
 
		System.out.println( result );
	}
}

public class Euler2
{
	public static void main(String[] args) 
	{	
		int result = 0;
		int p = 1;
		int q = 2;
		int tmp = 0;
 
		while ( q <= 4000000 )
		{
			if( q%2 == 0 )
			{
				result += q;
			}
 
			tmp = p+q;
			p = q;
			q = tmp;
		}
 
		System.out.println( result );
	}
}

public class Euler1 
{
	public static void main(String[] args) 
	{	
		int result = 0;
 
		for( int i=1; i<=1000.0/3; i++ )
		{
			result += 3*i;
 
			if( i>=1000.0/5 )
			{
				continue;
			}
 
			result += 5*i;
 
			if( i>=1000.0/15 )
			{
				continue;
			}
 
			result -= 15*i;
		}
 
		System.out.println( result );
	}
}