R, C, T = gets.split.map &:to_i
Sy, Sx = gets.split.map &:to_i
Gy, Gx = gets.split.map &:to_i
Board = $<.map{|s|s.chomp.chars}
dirs = R.times.map{|y|
  C.times.map{|x|
    [1,0,-1,0,1].each_cons(2).select{|dy,dx|
      Board.fetch(y+dy,[])[x+dx] != ?#
    }
  }
}


dp = R.times.map{[0.0]*C}
dp[Sy][Sx] = 1.0
[T, 5000+T%2].min.times{
  next_dp = R.times.map{ [0.0]*C }
  R.times{|y|
    C.times{|x|
      next if Board[y][x] == ?#
      d = dirs[y][x]
      if d.empty?
        next_dp[y][x] += dp[y][x]
        next
      end
      d.each{|(dy, dx)|
        next_dp[y+dy][x+dx] += dp[y][x] / d.size
      }
    }
  }
  dp = next_dp
}
p dp[Gy][Gx].to_f