class Modint:

    MOD = 1000000007

    def __init__(self, value: int) -> None:
        self.num = int(value) % self.MOD

    def __str__(self) -> str:
        return str(self.num)

    __repr__ = __str__

    def __add__(self, __x):
        if isinstance(__x, Modint):
            return Modint((self.num + __x.num))
        return Modint(self.num + __x)

    def __sub__(self, __x):
        if isinstance(__x, Modint):
            return Modint(self.num - __x.num)
        return Modint(self.num - __x)

    def __mul__(self, __x):
        if isinstance(__x, Modint):
            return Modint(self.num * __x.num)
        return Modint(self.num * __x)

    __radd__ = __add__
    __rmul__ = __mul__

    def __rsub__(self, __x):
        if isinstance(__x, Modint):
            return Modint(__x.num - self.num)
        return Modint(__x - self.num)

    def __pow__(self, __x):
        if isinstance(__x, Modint):
            return Modint(pow(self.num, __x.num, self.MOD))
        return Modint(pow(self.num, __x, self.MOD))

    def __rpow__(self, __x):
        if isinstance(__x, Modint):
            return Modint(pow(__x.num, self.num, self.MOD))
        return Modint(pow(__x, self.num, self.MOD))

    def __truediv__(self, __x):
        if isinstance(__x, Modint):
            return Modint(self.num * pow(__x.num, self.MOD - 2, self.MOD))
        return Modint(self.num * pow(__x, self.MOD - 2, self.MOD))

    def __rtruediv__(self, __x):
        if isinstance(__x, Modint):
            return Modint(__x.num * pow(self.num, self.MOD - 2, self.MOD))
        return Modint(__x * pow(self.num, self.MOD - 2, self.MOD))


def main():
    B, C, D = map(int, input().split())

    if C == 1:
        print(B*D)
        return

    print(Modint(B) * ((C - C**(D+1)) // (1-C)))


if __name__ == "__main__":
    main()