Pair of Toys

1023B1000· newbie1s256 MB⌨ stdin/stdout

Examples

Sample 1of 4

Input

8 5

Output

Sample 2of 4

Input

8 15

Output

Sample 3of 4

Input

7 20

Output

Sample 4of 4

Input

1000000000000 1000000000001

Output

500000000000

1023B.cpp

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Ln 11·137 BGNU C++20 (64)