You would want to take the sum from i equals 1 to i equals n of v of, and I'll do a left Riemann sum. But once again, we could use a midpoint. We could do trapezoids. We could do the right Riemann sum. But I'll just do a left one because that's what I depicted right here. v of t of i minus 1. So if this would be t0, it would be a.