# Enter your code here. Read input from STDIN. Print output to STDOUT
import sys
from heapq import *

def readInt():
    return int(input())
    
def readNInt():
    return map(int, sys.stdin.readline().split())
    
def readList():
    return list(map(int, sys.stdin.readline().split()))

def virus():
    a,b,t = readNInt()
    print pow((a+b)/2,t,10**9 + 7)
    
virus()