public class MaxDouble
{
    public static void main( String[] args )
    {
        double[] runa = StdIn.readAllDoubles();
        // HÉR VANTAR MEIRI FORRITSTEXTA
        double max = runa[0];
        for(int i = 1; i < runa.length; i++)
        {
            if(runa[i]>runa[i-1])
            max = runa[i];
        }
        System.out.println(max);
    }
}