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Arduino get text before I press button

I want to input some variable to arduino(i use MEGA)

the variable is for countdown timer so if I don't put button function in setup 

countdown timer will get 0 and loop will over(I mean over is countdown timer is overed but I still can trans with arduino).

so I have to put button function to setup 

but, when I put it to setup arduino will run before I put variable

i was wondering is there have function like Serial.parseInt()

to pause arduino run until get variable

has anyone can give me some tips , thanks in advance.

btw , sorry for my bad English

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