Block Diagram Transfer Function

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What is the equivalent block of the following block diagram

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The figure shown is not a block diagram since there are no sum blocks to connect the outputs of the blocks. And it is not a signal-flow graph as there are blocks.

Supposing the blocks correspond to gains in a signal-flow graph, we can use Mason's rule:

The equivalent transfer function is the ratio between the sum of the direct paths from x to y and the determinant of the loops.

Since we have two direct paths ($G(s)$ and $H(s)$) the numerator is equal to $G(s)+H(s)$, and since we have no loops, the determinant is $1$, yielding the resulting transfer function $\frac{G(s)+H(s)}{1}$.