{
	int @a, @b, @c;
	Comb<Mint> C;
	Mint ans;
	rep(i, 2, a + 2) {
		int m = a + b + c - i;
		ans += (Mint(2) ** m - 1) * C.C(m, c) * c / m * C.C(a + b - i, b - 1);
	}
	wt(ans);
}