I suppose that the result is 4000 cm^3 Because 1 liter = 1000 cubic centimeters. Therefore, 4 liters = 4* 1000 cubic centimeters = 4000 cm^3.
In Addition, there is another way to figure out, which is that 1 mL ( milliliters) is equivalent to 1 cubic centimeter. so, If there is 1,000 mL in a Liter then it’s possible to have 4,000 mL in 4 liters. Therefore, 4 liters = 4000 cm^3. Hope this helps.
