3. There are 64 small cubic blocks with an edge length of 1, each having two faces painted red and the other faces white. Among them, 20 small cubes have two adjacent faces painted red, and 44 small cubes have two opposite faces painted red. Now, they are assembled into a large cube. The maximum area of the red part on the surface of the large cube is $\qquad$
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3 \\
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