  We show that one can express Frobenius transformation on middle-dimensional
p-adic cohomology of Calabi-Yau threefold in terms of mirror map and instanton
numbers. We express the mirror map in terms of Frobenius transformation on
p-adic cohomology . We discuss a $p$-adic interpretation of the conjecture
about integrality of Gopakumar-Vafa invariants.
