A14869. Vasya and Coins

Vasya decided to go to the grocery store. He found in his wallet $a$ coins of $1$ burle and $b$ coins of $2$ burles. He does not yet know the total cost of all goods, so help him find out $s$ ( $s > 0$ ): the minimum positive integer amount of money he cannot pay without change or pay at all using only his coins.

For example, if $a=1$ and $b=1$ (he has one $1$ -burle coin and one $2$ -burle coin), then:

- he can pay $1$ burle without change, paying with one $1$ -burle coin,
- he can pay $2$ burle without change, paying with one $2$ -burle coin,
- he can pay $3$ burle without change by paying with one $1$ -burle coin and one $2$ -burle coin,
- he cannot pay $4$ burle without change (moreover, he cannot pay this amount at all).

So for $a=1$ and $b=1$ the answer is $s=4$ .

The first line of the input contains an integer $t$ ( $1 \le t \le 10^4$ ) — the number of test cases in the test.

The description of each test case consists of one line containing two integers $a_i$ and $b_i$ ( $0 \le a_i, b_i \le 10^8$ ) — the number of $1$ -burle coins and $2$ -burles coins Vasya has respectively.

For each test case, on a separate line print one integer $s$ ( $s > 0$ ): the minimum positive integer amount of money that Vasya cannot pay without change or pay at all.

- The first test case of the example is clarified into the main part of the statement.
- In the second test case, Vasya has only $1$ burle coins, and he can collect either any amount from $1$ to $4$ , but $5$ can't.
- In the second test case, Vasya has only $2$ burle coins, and he cannot pay $1$ burle without change.
- In the fourth test case you don't have any coins, and he can't even pay $1$ burle.