#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")

#define rd(v) v=0;{long _c;while(_c=*rp++-48,_c>=0)v=v*10+_c;}
#define wt(v) {ulong _z=v;do*--wp=_z%10+48;while(_z/=10);}
#define rep(v,e) for(long v=0;v<e;++v)

typedef unsigned long ulong;

#define MD 1000000007

#define M 1000001
int ifac[M];

int inverse(int a){
	int b=MD;
	int u=1;
	int v=0;
	int s,t;
	while(b){
		t=a/b;
		s=b; b=a-t*b; a=s;
		s=v; v=u-t*v; u=s;
	}
	if(u<0){
		u+=MD;
	}
	return u;
}

void mkfac(){
	long x=397802501;
	for(long i=M;i--;){
		ifac[i]=x;
		x=x*i%MD;
	}
}

long modpow(long a,long b){
	long z=1;
	while(b){
		if(b&1){
			z=z*a%MD;
		}
		b>>=1;
		a=a*a%MD;
	}
	return z;
}

int main(){
	mkfac();
	long h,w;
	{
		char rbuf[64];
		read(0,rbuf,sizeof rbuf);
		char*rp=rbuf;
		rd(h);
		rd(w);
	}
	long x=1,z=0;
	rep(i,h+1){
		z=((long)ifac[i]*ifac[h-i]%MD*modpow(x-1,w)-z)%MD;
		x=x*2%MD;
	}
	z=(z+MD)*inverse(ifac[h])%MD;
	{
		char wbuf[64],*wp=wbuf+sizeof wbuf;
		wt(z);
		write(1,wp,wbuf+sizeof wbuf-wp);
	}
	_exit(0);
}