#include<bits/stdc++.h>
#include<atcoder/all>
using namespace std;
using namespace atcoder;

typedef modint1000000007 mint;
typedef long long ll;

//defmodfact
const int COMinitMAX = 1100000;
mint fact[COMinitMAX+1], factinv[COMinitMAX+1];

void modfact(){
	fact[0] = 1;
	for (int i=1; i<=COMinitMAX; i++){
		fact[i] = fact[i-1] * i;
	}
	factinv[COMinitMAX] = fact[COMinitMAX].inv();
	for (int i=COMinitMAX-1; i>=0; i--){
		factinv[i] = factinv[i+1] * (i+1);
	}
}

mint cmb(int a, int b){
	if (a<b || b<0) return mint(0);
	return fact[a]*factinv[b]*factinv[a-b];
}
//--------


int main(){
	modfact();
	int h, w; cin >> h >> w;
	mint r = 1;
	mint ans = 0;
	for (int i=0; i<h+1; i++){
		ans += cmb(h, i) * r * (mint(2).pow(h-i) - 1).pow(w);
		r *= -1;
	}
	cout << ans.val() << endl;
}