The first uploaded image presents the ACF and PACF after the series differentiation. I observed the pattern at lags 7, 14, 21 etc. and recognized it as the seasonal pattern, having the original data that was "daily".
The second picture presents the ACF and PACF after seasonal adjustment. Now i need to choose parameters p and q for ARIMA model. (I(d) is already taken care of as i did one differentiation thus d = 1)
So, generally i am looking for help with such a problem. I described it in description of the uploaded photos.