Get number of specific vertex on model

hi all, I have a model and want to find out - say, the number of the vertex on top of the right thumb. I noticed that vertex numbers in C4D and Unity are not the same, so checking in the 3D editor is not an option. I wrote a script with bake.mesh(), which allows me to manually loop through the vertice array of the model and transform a cube with those coordinates. But this is tedious, since it takes a long time to find the vertice I want. I need those vertice numbers to get their coordinates out of the bake.mesh() array. Is there a faster way to do this? Thanks :)