#In this problem, the task is to read a code of a product 1, the number of units of product 1, the price for one unit of product 1, the code of a product 2, the number of units of product 2 and the price for one unit of product 2. After this, calculate and show the amount to be paid.

#Input
#The input file contains two lines of data. In each line there will be 3 values: two integers and a floating value with 2 digits after the decimal point.

#Output
#The output file must be a message like the following example where "Valor a pagar" means Value to Pay. Remember the space after ":" and after "R$" symbol. The value must be presented with 2 digits after the point.

product1 = input().split(" ")
product2 = input().split(" ")

cod1, unit1, price1 = product1
cod2, unit2, price2 = product2

total = (int(unit1) * float(price1)) + (int(unit2) * float(price2))

print("Value to pay: R$ %0.2f" %total)