Random number from a certain number range

Range of numbers: 1-20

My question: You choose a number between 1-20 and the game should then choose a random number.

Example: the player chooses the number 13 from 1-20, the game must randomly choose a number between 1-13 and then display it

I hope the google translator is enough haha,Number range: 1-20

My question is:

The player types in a number and the game then chooses a number.

Example: the player takes the number 13, The game must now choose a random number between 1-13 and then display

I Hope google translator is enough haha