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To do this you need to know the visible area in that pyramid since paint can apply only to outer surfers

Use

= (n/2) (n + 1)

= (100/2) (101)

= 5050

This is the number of faces in one surface

since there are 4 surfaces + 1 top surface

= 5050 * 4

= 20 200

The total side area covered by one block is 97* 63

= (97* 63) * 20200

= 123442200cm^2

= 12344.22 m^2

The area of the opened tops

= (100* 100) (97* 97)

= 94090000 cm^2

= 9409 m^2

Total area

= 9409 m^2 + 12344.22 m^2

= 21753.22 m^2

Since paint can apply to 3 sqm

= (21753.22 m^2)/3

= 7251.07 liters

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