a, b = read_line.split.map &.to_i
ans = 0.0
count = 6 ** (a + b)
[2, 3, 5, 7, 11, 13].each_repeated_permutation(a) do |x|
  [4, 6, 8, 9, 10, 12].each_repeated_permutation(b) do |y|
    ans += x.reduce(1i64) { |acc, v| acc * v } * y.reduce(1i64) { |acc, v| acc * v } / count
  end
end
puts ans