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

def power(x,y):

    if y == 0:
        return 1
    temp = power(x, y/2)
    if y%2 == 0:
        return temp*temp%1000000007
    else:
        return (x*temp*temp)%1000000007

a,b,t=map(int,raw_input().split(' '))
virus=1
virus=power(int((a+b)*0.5),t)
print virus