need help with red heart pattern lc2712_0-1

Has anyone out there made this pattern? I'm having trouble with the pattern instructions where it says "Sleeve Edging Row 1: With right side facing, using larger hook, working across opposite side of foundation ch, join thread in first ch on bottom edge of Sleeve, ch 1, sc in first 0 (0, 1) ch, sc2tog in next 2 sts; repeat from * across to last 0 (0, 1) st, sc in last 0 (0, 1) st; turn---35 (39, 43) sets.

what does the number 0 represent?

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