Score : 300 points
You've come to your favorite store Infinitesco to buy some ice tea.
The store sells ice tea in bottles of different volumes at different costs. Specifically, a 0.25-liter bottle costs Q yen, a 0.5-liter bottle costs H yen, a 1-liter bottle costs S yen, and a 2-liter bottle costs D yen. The store has an infinite supply of bottles of each type.
You want to buy exactly N liters of ice tea. How many yen do you have to spend?
Input is given from Standard Input in the following format:
Q H S D N
Print the smallest number of yen you have to spend to buy exactly N liters of ice tea.
20 30 70 90 3
150
Buy one 2-liter bottle and two 0.5-liter bottles. You'll get 3 liters for 90 + 30 + 30 = 150 yen.
10000 1000 100 10 1
100
Even though a 2-liter bottle costs just 10 yen, you need only 1 liter. Thus, you have to buy a 1-liter bottle for 100 yen.
10 100 1000 10000 1
40
Now it's better to buy four 0.25-liter bottles for 10 + 10 + 10 + 10 = 40 yen.
12345678 87654321 12345678 87654321 123456789
1524157763907942