#include<stdio.h>
#include<stdlib.h>

typedef long long int int64;

void run(void){
  int n;
  scanf("%d",&n);
  int *a=(int *)calloc(n+1,sizeof(int));
  int *b=(int *)calloc(n+1,sizeof(int));
  int i;
  for(i=0;i<=n;i++) scanf("%d",a+i);
  for(i=0;i<=n;i++) scanf("%d",b+i);
  const int mod=1000000007;
  for(i=1;i<=n;i++) b[i]=(b[i-1]+b[i])%mod;
  int ans=0;
  for(i=0;i<=n;i++) ans=(ans+(int64)a[i]*b[n-i])%mod;
  printf("%d\n",ans);
}

int main(void){
  run();
  return 0;
}