Do you mean how would you have the different LEDs flash a different number of times depending on how many times you push the button? This could be accomplished by waiting for the input pin to go high then adding 1 to a pre-defined variable. You would then wait for the input pin to go low before monitoring the input for a high signal. After a pre-defined amount of time waiting for the high signal, the number of button pushes would be stored in the variable that holds the count.