I have the Difference in means, the Standard Error, Variance, Lower an Upper CI limits, z-value, p-value and number of participants as shown in the attached picture (at the bottom of the picture)

Using them I need to calculate the Mean.

I calculated the Standard Deviation using the RevMan calculator as shown in the picture (in the upper part)

But RevMan does not calculate the Mean, as shown in the picture they are not automatically calculated.

That's because it is not possible to calculate the Mean with all the data I have?