  n this paper we define an invariant of a pair of 6 dimensional symplectic
%optional manifold with vanishing 1st Chern class and its Lagrangian
submanifold with vanishing Maslov index. This invariant is a function on the
set of the path connected components of the bounding cochains (solution of A
infinity version of Maurer-Cartan equation of the filtered A infinity algebra
associated to the Lagrangian submanifold). In the case when the Lagrangian
submanifold is a rational homology sphere, it becomes a numerical invariant.
This invariant depends on the choice of almost complex structure. The way how
it depends on the almost complex structure is described by a wall crossing
formula which involves moduli space of pseudo-holomorphic spheres.
