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

#define rd() ({int _v=0,_c;while(_c=*rp++-48,_c>=0)_v=_v*10+_c;_v;})
#define wt(v) {unsigned _z=v;do*--wp=_z%10+48;while(_z/=10);}
#define rep(v,e) for(int v=0;v<e;++v)
#define rep3(v,s,e) for(int v=s;v<e;++v)
#define rrep(v,e) for(int v=e;v--;)
#define rrep3(v,s,e) for(int v=e;--v>=s;)
#define min(a,b) (a<=b?a:b)
#define MD 1000000007

int v[100001],r[100001];

int main(){
	char*mmap();
	char*rp=mmap(0l,1l<<25,1,2,0,0ll);
	long n=rd();
	long m=rd();
	long s=1;
	long t=1;

	v[0]=1;
	rep(i,n){
		int a=rd();
		rrep(j,s){
			int x=v[j]+v[j+a];
			v[j+a]=x-(x<MD?0:MD);
		}
		s+=a;
	}
	{
		int x=0;
		rep(i,s){
			x+=v[i];
			v[i]=x-=x<MD?0:MD;
		}
	}

	r[0]=1;
	rep(i,m){
		int a=rd();
		rrep(j,t){
			int x=r[j]+r[j+a];
			r[j+a]=x-(x<MD?0:MD);
		}
		t+=a;
	}

	int a=rd();
	int b=rd();
	int l=-1;
	int h=0;
	int z=0;
	rep3(i,1,t){
		z=(z+(long)r[i]*(long)(v[h=min(h+b,s-1)]-v[(l=min(l+a,s-1))]+MD))%MD;
	}

	char wbuf[64],*wp=wbuf+sizeof wbuf;
	wt(z);
	write(1,wp,wbuf+sizeof wbuf-wp);
	_exit(0);
}