# Enter your code here. Read input from STDIN. Print output to STDOUT

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
            

a,b,t = map(int,raw_input().strip().split(' '))

num = 0.5 * (a + b)
print power(int(num), t, (10**9)+7)