一个有关二进制数字的输出的问题, 用C语言的输出,怎么实现的?

Problem Description
If the quantity of '1' in a number's binary digits is n, we call this number a n-onebit number. For instance, 8(1000) is a 1-onebit number, and 5(101) is a 2-onebit number. Now give you a number - n, please figure out the sum of n-onebit number belong to [0, R).

Input
Multiple test cases(less than 65). For each test case, there will only 1 line contains a non-negative integer n and a positive integer R(n≤1000,0<R<21000), R is represented by binary digits, the data guarantee that there is no leading zeros.

Output
For each test case, print the answer module 1000000007 in one line.

Sample Input
1 1000

Sample Output
7

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