import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int num1 = input.nextInt() -1;
        input.nextLine();
        int same = input.nextInt();
        while(num1 != 0) {
            int a = input.nextInt();
            if (a != same) {
                System.out.println("No");
                num1 = 20;
                break;
            }
           num1--;
        }
        if(num1==0){
            System.out.println("Yes");
        }

    }
}

Traceback (most recent call last):
  File "/usr/lib/python3.8/py_compile.py", line 144, in compile
    code = loader.source_to_code(source_bytes, dfile or file,
  File "<frozen importlib._bootstrap_external>", line 846, in source_to_code
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "a.py", line 2
    public class Main {
           ^
SyntaxError: invalid syntax

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3.8/py_compile.py", line 209, in main
    compile(filename, doraise=True)
  File "/usr/lib/python3.8/py_compile.py", line 150, in compile
    raise py_exc
__main__.PyCompileError:   File "a.py", line 2
    public class Main {
           ^
SyntaxError: invalid syntax


During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3.8/runpy.py", line 194, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/usr/lib/python3.8/runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "/usr/lib/python3.8/py_compile.py", line 218, in <module>
    sys.exit(main())
  File "/usr/lib/python3.8/py_compile.py", line 213, in main
    if quiet < 2:
NameError: name 'quiet' is not defined