import sys
for line in sys.stdin:
    a, b, t = line.split(' ')
a, b, t = int(a), int(b), int(t)
#for step in range(t):
#    count = a * count + b * count
fudge = 1 if (a + b) % 2 != 0 else 0
count = pow((a + b)//2 + fudge, t, (10**9 + 7))
print(count)