What are the hello to all the children of the world notes on the piano?

The notes for "Hello to All the Children of the World" on the piano typically follow a simple melody that can be played in the key of C major. The main melody often starts with the notes C, D, E, and F, progressing through a series of ascending and descending notes. For a precise arrangement, you would need to refer to sheet music or a piano tutorial specific to the song. If you're looking for a simplified version, it can usually be played using just a few basic chords.