Global Variable to correct martingale function

 My EA has a martingale function and it’s working correctly. It even maintains the martingale after a acidental reboot from the machine. Nevertheless after a couple days it doesn’t work well anymore. I want the martingale count remains on a separate file to be sure that even after 2 or 3 days the EA doesn’t “forget” to open that trade with the correct lot. 

Resuming: I want to save martingale level to global variable of the MT terminal