Octopus Truth

There is a colony of octopuses where $6-$legged and $8-$legged octopuses tell the truth, while $7-$legged octopuses lie. In a group of $4$ octopuses, each one claims there are a different amount of legs between them: The $4$ octopuses claim there are $28,27,26,$ and $25$ legs between them, respectively. How many legs are there between them?