Merge

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Merge to get the answer. ### Input - It contains a single line of input, two integers $A, B$. ### Output Output in a single line answer modulo 1000000007. ### Constraints - $1 \leq A \leq 10000000$ - $1 \leq B \leq 10000000$ ### Subtasks - 30 points : $1 \leq R \leq 10000$ - 70 points : $1 \leq R \leq 10^9$ ### Sample Test Cases **Sample 1** Input: ``` 2 5 ``` Output: ``` 21 ``` **Sample 2**

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solution.cppC++17

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