Runtime Error in java code

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Java

package acm1st;
 class Acm1st
{
    private static long i;
    public static void main(String[] args)
    {
             long x=1000000;
             int  y= count(1,x);
             System.out.println(1+"\t"+x);
             if(x%2==0)
             {
               int z=  count(x, x);
               System.out.print(Math.max(z, y));

             }
          System.exit(0);

    }
    private static int count(long x,long y)
        {
           long num =0;int max=1,counter=1;

           for( i=x;i<=y;i+=2)
            {
               num =i;
            while (num != 1)
             {
                if (num % 2 == 0)
                {
                    num/= 2;

                }
                else
                {
                   num = (num * 3) + 1;
                }

                counter++;
             }
            if(max<counter)
                max=counter;
            counter=1;
           }
           return max;
        }

}

Give me This



result: Runtime error time: 0.07s memory: 380160 kB signal: -1
input: no
output: no
stderr:

Exception in thread "main" java.lang.NoClassDefFoundError: Acm1st (wrong name: acm1st/Acm1st)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:791)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)