# A Logic Puzzle

Algebra Level 5

$f(1111)=4$ $f(1234)=3$ $f(4567)=2$ $f(1357)=4$ $f(6518)=4$ $f(3817)=6$ $f(8008)=6$ $f(1000)=4$ $f(2014)=?$

Hint: Each digit is valuable.

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