import math, sys

def power(x,y,p): 
    res=1
    x = x%p
    while (y>0):
        if (y & 1):
            res = (res*x) %p
        y = y>>1
        x =(x*x)%p
    return res


def func(a,b,t):
    mod = 1000000007
    k = (a+b)/2
    #tot = power(k,t, mod)
    tot = pow(k,t,mod)
    return tot


for  line  in sys.stdin:
    a,b,t = [int(i) for i in line.strip().split()]
    
print(pow(int((a+b)/2),t,1000000007))