Malek Dance Club

1000ms

262144K

Description:

As a tradition, every year before IOI all the members of Natalia Fan Club are invited to Malek Dance Club to have a fun night together. Malek Dance Club has 2ⁿ members and coincidentally Natalia Fan Club also has 2ⁿ members. Each member of MDC is assigned a unique id i from 0 to 2ⁿ - 1. The same holds for each member of NFC.

One of the parts of this tradition is one by one dance, where each member of MDC dances with a member of NFC. A dance pair is a pair of numbers (a, b) such that member a from MDC dances with member b from NFC.

The complexity of a pairs' assignment is the number of pairs of dancing pairs (a, b) and (c, d) such that a < c and b > d.

You are given a binary number of length n named x. We know that member i from MDC dances with member $\text{[math]}$ from NFC. Your task is to calculate the complexity of this assignment modulo 1000000007 (10⁹ + 7).

Expression $\text{[math]}$ denotes applying «XOR» to numbers x and y. This operation exists in all modern programming languages, for example, in C++ and Java it denotes as «^», in Pascal — «xor».

Input:

The first line of input contains a binary number x of lenght n, (1 ≤ n ≤ 100).

This number may contain leading zeros.

Output:

Print the complexity of the given dance assignent modulo 1000000007 (10⁹ + 7).

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Informação

Provedor Codeforces

Código CF319A