Description:
How to make a cake you'll never eat.
Ingredients.
- 2 carrots
- 0 calories
- 100 g chocolate spread
- 1 pack of flour
- 1 egg
Method.
- Put calories into the mixing bowl.
- Take carrots from refrigerator.
- Chop carrots.
- Take chocolate spread from refrigerator.
- Put chocolate spread into the mixing bowl.
- Combine pack of flour into the mixing bowl.
- Fold chocolate spread into the mixing bowl.
- Add chocolate spread into the mixing bowl.
- Put pack of flour into the mixing bowl.
- Add egg into the mixing bowl.
- Fold pack of flour into the mixing bowl.
- Chop carrots until choped.
- Pour contents of the mixing bowl into the baking dish.
Serves 1.
Input:
The only line of input contains a sequence of integers a0, a1, ... (1 ≤ a0 ≤ 100, 0 ≤ ai ≤ 1000 for i ≥ 1).
Output:
Output a single integer.
Sample Input:
4 1 2 3 4
Sample Output:
30
