MOD = 10**9 + 7
b,c,d = map(int,input().split())
c %= MOD
if c == 1:
    print(b*d%MOD)
else:
    ans = b*c*(pow(c,d,MOD) - 1 + MOD)*pow(c - 1,MOD - 2,MOD)%MOD
    print(ans)