TTU ACM-ICPC practice 2 (Sep-12-2017)

#### Start

2017-09-12 23:00 CEST

## TTU ACM-ICPC practice 2 (Sep-12-2017)

#### End

2017-09-19 23:00 CEST
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# Problem IBus

A bus with $n$ passengers opens its door at the bus stop. Exactly half of its passengers and an additional half of a passenger get out. On the next stop, again, half of the passengers plus half of a passenger leave the bus. This goes on for $k$ stops in total. Knowing that the bus leaves the last stop empty, and that no one was hurt during the trip, determine the initial number $n$ of people in the bus.

## Input

The first line of input contains the number of test cases $T$. The descriptions of the test cases follow:

The only line of each test case contains the number of stops $k$, $1 \leq k \leq 30$.

## Output

For each test case, output a single line containing a single integerâ€”the initial number of bus passengers.

Sample Input 1 Sample Output 1
2
1
3

1
7