#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <atcoder/modint>
using namespace std;
using i32 = int32_t;
using u32 = uint32_t;
using i64 = int64_t;
using u64 = uint64_t;
#define rep(i,n) for(int i=0; i<(int)(n); i++)


const i64 INF = 1001001001001001001;
using modint = atcoder::static_modint<998244353>;



int main(){
    int N; cin >> N;
    vector<i64> A(N); rep(i,N) cin >> A[i];
    vector<i64> B(N); rep(i,N) cin >> B[i];
    int l = 0;
    i64 ans = 0;
    for(int r=1; r<N; r++){
        if(A[r-1] + B[r-1] >= A[r] + B[r] || A[r-1] - B[r-1] >= A[r] - B[r]) l = r;
        ans += r - l;
    }
    cout << ans << '\n';
    return 0;
}


struct ios_do_not_sync{
    ios_do_not_sync(){
        std::ios::sync_with_stdio(false);
        std::cin.tie(nullptr);
    }
} ios_do_not_sync_instance;