import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
sys.setrecursionlimit(10 ** 7)


def modinv(a, mod=10 ** 9 + 7):
    return pow(a, mod - 2, mod)


b, c, d = map(int, readline().split())
mod = 10 ** 9 + 7
if c == 1:
    print(b * d)
else:
    print(b * (pow(c, d + 1, mod) - c) * modinv(c - 1, mod) % mod)