nanbran

I just have a question about counting the number of atoms in a hydrate. I know that it is very simple, however, I forget! So, for example, take MgSO4*7H2O. I know that there are 1Mg, 1S, 11 O's, and 14H's, however, when you add a 2 in front of the formula like this: 2MgSO4*7H2O... how many of each are there?? I think there are 2Mg's, 2S's, 15 O's, and 14 H's... Is this correct? Thank you!!