Спільний звук

guys i can read you're mind if you don't believe me pick a number from 1 to 13 any number i give you 5 second to think of it. got it now you have to is add 4 to the number I give you 3 second time to do it. next is multiply the number you got by 2 and subtract 6 from it i give you 3 second time to do it. don't worry guys we are close next you have to divide your number with 2 and finally subtract the original number you taken at the start of the short i will read you're mind in. the number you