Problem Statement

You are given a sequence $A=(A_0,A_1,\\dots,A_{63})$ of length $64$ consisting of $0$ and $1$.

Find $A_0 2^0 + A_1 2^1 + \\dots + A_{63} 2^{63}$.

Constraints

• $A_i$ is $0$ or $1$.

Input

The input is given from Standard Input in the following format:

$A_0$ $A_1$ $\\dots$ $A_{63}$

Output

Print the answer as an integer.

Sample Input 1

1 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

Sample Output 1

13

$A_0 2^0 + A_1 2^1 + \\dots + A_{63} 2^{63} = 2^0 + 2^2 + 2^3 = 13$.

Sample Input 2

1 0 1 0 1 0 0 0 0 1 0 0 1 1 0 1 1 1 1 0 0 0 1 0 0 1 1 1 1 1 1 0 0 0 0 1 0 1 0 1 0 1 1 1 1 0 0 1 1 0 0 0 0 1 0 1 0 1 0 1 0 0 0 0

Sample Output 2

766067858140017173