For instance if given values are $f(1.1) = 1$, $f(1.9) = 2$, $f(2.7) = 3$, $f(3.5) = 4$, $f(4.3) = 5$ and ever increasing by $0.8$ for each number, if I were to enter a value of $1.5$ the answer is $1.5$ but if I enter $2.3$ the answer is $2.5$ what is a formula that would express this?
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