A-Plus Auto Body is painting flames on a customer's car. They need 2 1/2 pints of red, 3 pints of orange, 3/4 pint of yellow, and 7 pints of blue paint. They use 3/4 of the blue paint to make the flames. They need 7 3/4 pints to paint the next car blue. How much more blue paint will they need to buy???