The ornamental design for a paperproduct, as shown and described.
The sole FIGURE is a plan view of a paper product showing one repeat unit of my new design, which is understood to repeat uniformly throughout the length and width of a paper product.
The broken line drawing represents the boundaries of the repeat unit of the claimed design. The broken lines in the figures and the specific length and width of the paper product to which the design is applied form no part of the claimed design.