a, b, t = gets.strip.split(' ').map(&:to_i)
f = (a + b) / 2
m = 10 ** 9 + 7

arr = []
loop do
  q = Math.log(m, f).floor + 1
  r = (f ** q).modulo(m)
  arr << f ** t.modulo(q)
  t /= q
  break if t == 0
  f = r
end

puts arr.reduce(1, &:*).modulo(m)