#include <bits/stdc++.h>
using namespace std;
#define int long long
signed 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];
  int streak = 0;
  int ans = 0;
  for(int i=1;i<N;i++){
      if(A[i]+min(B[i],B[i-1]) > A[i-1]+max(B[i],B[i-1])) streak++;
      else{
          ans += streak*(streak+1)/2;
          streak=0;
      }
  }
  ans += streak*(streak+1)/2;
  cout<<ans<<endl;
}