SUMIF - Summing Data from several specified cells based on data of corresponding cells

On the "CurrentCustomer" worksheet tab I am trying to accomplish the following:
When the merged cells in the F column (F3, F25, F47...F443) equal the word "Contract", I need the corresponding total cells in the E column (E23, E45, E67...E463) to add up, if and only if the corresponding F column merged cell equals "Contract".

For example, using the first three ranges, if F3, F25, & F47 all equal "Contract", I need the corresponding E23, E45, & E67 to add up. If F3 & F47 equal "Contract", but F25 equals anything other than contract I need E23 & E67 to add up only.

Thanks,