D:\User\Cristiano Colangelo\Desktop\mcm.java:13: error: cannot access MCD
        int mcm = c * d / MCD.CalcolaMCD(c, d);
                          ^
  bad class file: .\MCD.class
    class file contains wrong class: capitolo10.MCD
    Please remove or make sure it appears in the correct subdirectory of the classpath.
1 error
[Finished in 0.3s with exit code 1]
[shell_cmd: javac "D:\User\Cristiano Colangelo\Desktop\mcm.java"]
[dir: D:\User\Cristiano Colangelo\Desktop]
[path: C:\ProgramData\Oracle\Java\javapath;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;C:\Program Files (x86)\Intel\iCLS Client\;C:\Program Files\Intel\iCLS Client\;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\Windows Kits\8.1\Windows Performance Toolkit\;C:\Program Files\Microsoft SQL Server\110\Tools\Binn\;C:\Program Files (x86)\Microsoft SDKs\TypeScript\1.0\;C:\Program Files (x86)\IVI Foundation\VISA\WinNT\Bin;C:\Program Files\Java\jdk1.8.0_25\bin;C:\Program Files (x86)\Calibre2\;C:\Windows\SysWOW64]