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Which resistor does the capacitor charge through?

Let's say we have a really simple circuit consisting of a capacitor sandwiched between two resistors, all in series. When the switch flips, which resistor does the capacitor charge through? I feel like the intuitive answer is that it charges through the "downstream" resistor because electrons move in the opposite direction of the current, but is that the case? If it's not, then why?

I'm basically wondering which resistor value I need to use to calculate the time constant. It doesn't make sense to me that I would combine the values, but I'm wondering if I'm wrong there as well. Sorry if this is a trivial question, but I haven't been able to find an answer anywhere.