SUM IF by reference

in the attached spreadsheet I need to produce the sums in I21 & I22 by reference to G21 & G22. using these numbers I need to look up all account numbers in F13:F18 and sum all matching account numbers.

e.g. Cash should = 10,000 + 1,000,000 + 0 + 100,000 + 0
AR should = 2,900,000

Any help would be appreciated