def modpower(x, y, m):
    out = int(1)
    x = int(x % m)
    while (y > 0):
        if ((y % 2) == 1):
            out = int((x*out) % m)
            y -= 1
        
        y = int(y >> 1)
        x = int((x*x) % m)
    return out

a, b, t = list(map(int, input().strip().split(' ')))
e_ab = (a+b)//2

print(int(modpower(e_ab, t, int(1e9 + 7))))