I pull the lever to save half a person
https://en.wikipedia.org/wiki/1_%2B_1_%2B_1_%2B_1_%2B_%E2%8B%AF#:~:text=%CE%B6(0)%20%3D-,%E2%88%92,.,-Emilio%20Elizalde%20presents

eventually the people that have not been hit by the trolley will die of starvation
not pulling the lever would spare more people from a slow death