import numpy as np

R, C, T = map(int, input().split())
Sy, Sx = map(int, input().split())
Gy, Gx = map(int, input().split())
B = [input() for _ in range(R)]

grid2int = lambda y, x: y * C + x

matr = [[0] * (R * C) for _ in range(R * C)]

for y in range(1, R - 1):
    for x in range(1, C - 1):
        if B[y][x] == '#':
            continue

        coor = grid2int(y, x)
        movable = []
        for dy, dx in ((1, 0), (0, 1), (-1, 0), (0, -1)):
            ydy, xdx = y + dy, x + dx
            if B[ydy][xdx] == '.':
                movable.append(grid2int(ydy, xdx))

        if not movable:
            matr[coor][coor] = 1
            continue

        l = len(movable)
        for p in movable:
            matr[coor][p] = 1 / l
matr = np.array(matr)
X = np.zeros(R * C)
X[grid2int(Sy, Sx)] = 1

Y = X @ np.linalg.matrix_power(matr, T)
print(Y[grid2int(Gy, Gx)])