package main
import (
    "fmt"
    "math/big"
)

func main() {
    var a, b, t int64
    fmt.Scanf("%d %d %d\n", &a, &b, &t)
    
    x := big.NewInt(a)
    y := big.NewInt(b)
    z := big.NewInt(t)
    
    x.Add(x, y)
    x.Div(x, big.NewInt(2.0))
    
    m := big.NewInt(1000000000.0 + 7.0)
    x.Exp(x, z, m)
    
    fmt.Println(x)
}