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

char*mmap();
#define RD(v) int v=0;{int _c;while(_c=*rp++-48,_c>=0)v=v*10+_c;}

#define WTHI(v) {long _z=v,_n=0,_d=0;while(++_n,_d=_d<<8|0x30|_z%10,_z/=10);*(long*)wp=_d;wp+=_n;}
#define WTLO(v) {long _z=v,_n=8,_d=0;while(_d=_d<<8|0x30|_z%10,_z/=10,--_n);*(long*)wp=_d;wp+=8;}
#define WT(v) if(v>=100000000){WTHI(v/100000000);WTLO(v);}else{WTHI(v);}

#define MD 1000000007

int a[100001];

main(){
	char*rp=mmap(0l,11l*200004,1,2,0,0ll);
	RD(n);
	for(int i=0;i<=n;++i){
		RD(t);
		a[i]=t;
	}
	int bsum=0;
	int sum=0;
	for(int i=0;i<=n;++i){
		RD(b);
		bsum+=b;
		bsum-=bsum<MD?0:MD;
		sum=(sum+(long)bsum*a[n-i])%MD;
	}
	char wbuf[16],*wp=wbuf;
	WT(sum);
	write(1,wbuf,wp-wbuf);
	_exit(0);
}