how to reset Entry ID

Hi , i would like to know how to reset the Entries ID

since i made some test myself i reached 30 entries

i deleted them all , but now when my customers fill the form , it show them entry #31 , while i deleted all the previous ones from trash etc ..

so please how to reset the entry ID , so whenever my customers fill the form , it will be #2 , #3 etc ..

thanks