16005번 - Kbin 서브태스크다국어

We call the k-binary number a natural number which has in its binary representation exactly k digits of 1. For example, the 23 is a 4-binary number because the binary representation is 10111 and contains 4 digits of 1.

Given the N and k values, calculate the sum S of all k-binary numbers which are strictly lower than N. Because the sum is very large, you have to calculate modulo 1234567.

The standard input contains the values N and k separated by a single space.

The standard output will contain the number S modulo 1234567.

• 2 ≤ N ≤ 10¹⁵
• 0 ≤ K ≤ 50

• 1 – 1
• 2 – 10
• 3 – 11
• 4 – 100
• 5 – 101
• 6 – 110
• 7 – 111
• 8 – 1000
• 9 – 1001
• 10 – 1010
• 11 – 1011
• 12 – 1100
• 13 – 1101
• 14 – 1110

S=7+11+13+14=45