k-th divisor

762A1400· specialist2s256 MB⌨ stdin/stdout

#math #number theory

Examples

Sample 1of 3

Input

4 2

Output

Sample 2of 3

Input

5 3

Output

-1

Sample 3of 3

Input

12 5

Output

762A.cpp

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Ln 11·137 BGNU C++20 (64)