#include <bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;
using ll=long long;
using Graph=vector<vector<int>>;
#define INF 1000000000000000000
#define MOD 998244353
#define MAX 1000000

int main(){
  int N;
  cin>>N;
  vector<int> A(N),B(N);
  for(int i=0;i<N;i++){
    cin>>A[i];
  }
  for(int i=0;i<N;i++){
    cin>>B[i];
  }

  ll ans=0;
  int cnt=1;
  for(int i=1;i<N;i++){
    if(abs(B[i]-B[i-1])<A[i]-A[i-1]){
      cnt++;
    }else{
      ans+=(ll)cnt*((ll)cnt-1)/2;
      cnt=1;
    }
  }
  ans+=(ll)cnt*((ll)cnt-1)/2;

  cout<<ans<<'\n';
}