Contest: Task: Related: TaskA TaskC

Score : $200$ points

Takahashi's shop sells $N$ products. The usual price of the $i$-th product is $A_i$ yen (Japanese currency).

It has a bargain sale today, with a discount of $1$ yen off the usual prices for the $2$-nd, $4$-th, and the subsequent even-indexed products. The $1$-st, $3$-rd, and the subsequent odd-indexed products are sold for their usual prices.

You have $X$ yen. Can you buy all the $N$ products with this money?

- $1 \leq N \leq 100$
- $1 \leq X \leq 10000$
- $1 \leq A_i \leq 100$
- All values in input are integers.

Input is given from Standard Input in the following format:

$N$ $X$ $A_1$ $A_2$ $\ldots$ $A_N$

If you can buy all the $N$ products, print `Yes`

; otherwise, print `No`

.

2 3 1 3

Yes

You can buy the $1$-st product for $1$ yen and the $2$-nd product for $2$ yen, $1$ yen off the usual price. You have just enough money, $3$ yen, to buy both of them.

4 10 3 3 4 4

No

You can buy these four products for $3$ yen, $2$ yen, $4$ yen, and $3$ yen, respectively. You need $12$ yen to buy all of them, and since you have only $10$ yen, you cannot buy all of them.

8 30 3 1 4 1 5 9 2 6

Yes