Jars

comp_jar = int(input())
jel_jar = int(input())

comp_jar_all = comp_jar + 1
jel_jar_all = jel_jar + 1

quant_comp_all = comp_jar_all * 0.300 + comp_jar_all * 0.300 * 0.05
quant_jel_all = jel_jar_all * 0.650 + jel_jar_all * 0.650 * 0.10

quant_fruit_all = quant_comp_all + quant_jel_all

price = quant_fruit_all * 3.20

print("%.2f" % price)