Development view of cube with numbers

Fig. 1 and Fig. 2 are development views of the cube in which the numbers from 1 to 6 were written to each face.

It is considered that the sum of numbers written to three faces gathering in the one vertex of each cube.

As for Fig.1, the greatest sum of numbers is 15.

In the case of Fig. 2, find the greatest sum of numbers.

Answer