let args = readLine()!.characters.split(" ").map({Int(String($0))!})

let a = args[0]
let b = args[1]
let t = args[2]

let modulo = 1000000007

func pow(x: Int, _ y: Int) -> Int {
  var x = x
  var y = y
  var result = 1
  
  x = x % modulo

  while y > 0 {
    if y % 2 == 1 {
      result = (result * x) % modulo
    }
    
    y /= 2
    x = (x * x) % modulo
  }
  
  return result
}

let expectedValue = pow((a + b) / 2, t)

print(expectedValue)