Any help is appreciated

Observations on a time series Y over 7 periods and an associated forecast method is shown in the Table below: Period Y Forecast 1 88 X 2 76 88 3 82 82 4 86 82 5 80 84 6 86 82 7 85 84 If you have been told the above model is a Simple Exponential Smoothing model, what would be the value of X