Fun function

Very easy

Execution time limit is 1 second

Runtime memory usage limit is 128 megabytes

Find the value of the function

f (x, y) = ⎩ ⎨ ⎧ 0, x \leq 0 or y \leq 0 f (x - 1, y - 2) + f (x - 2, y - 1) + 2, x \leq y f (x - 2, y - 2) + 1, x > y

Input

Two integers $x, y (0 \leq x, y \leq 50)$ .

Print the value of the function $f (x, y)$ .

Input #1

Answer #1

Input #2

Answer #2

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