# include "bits/stdc++.h"
using namespace std;
using LL = long long;
using ULL = unsigned long long;
const double PI = acos(-1);
template<class T>constexpr T INF() { return ::std::numeric_limits<T>::max(); }
template<class T>constexpr T HINF() { return INF<T>() / 2; }
template <typename T_char>T_char TL(T_char cX) { return tolower(cX); };
template <typename T_char>T_char TU(T_char cX) { return toupper(cX); };
typedef pair<LL, LL> pii;
const int vy[] = { -1, -1, -1, 0, 1, 1, 1, 0 }, vx[] = { -1, 0, 1, 1, 1, 0, -1, -1 };
const int dx[4] = { -1,0,1,0 }, dy[4] = { 0,-1,0,1 };
const char dir[4] = { 'u','l','d','r' };
int popcnt(unsigned long long n) { int cnt = 0; for (int i = 0; i < 64; i++)if ((n >> i) & 1)cnt++; return cnt; }
int d_sum(LL n) { int ret = 0; while (n > 0) { ret += n % 10; n /= 10; }return ret; }
int d_cnt(LL n) { int ret = 0; while (n > 0) { ret++; n /= 10; }return ret; }
LL gcd(LL a, LL b) { if (b == 0)return a; return gcd(b, a%b); };
LL lcm(LL a, LL b) { LL g = gcd(a, b); return a / g*b; };
# define ALL(qpqpq)           (qpqpq).begin(),(qpqpq).end()
# define UNIQUE(wpwpw)        sort(ALL((wpwpw)));(wpwpw).erase(unique(ALL((wpwpw))),(wpwpw).end())
# define LOWER(epepe)         transform(ALL((epepe)),(epepe).begin(),TL<char>)
# define UPPER(rprpr)         transform(ALL((rprpr)),(rprpr).begin(),TU<char>)
# define FOR(i,tptpt,ypypy)   for(LL i=(tptpt);i<(ypypy);i++)
# define REP(i,upupu)         FOR(i,0,upupu)
# define INIT                 std::ios::sync_with_stdio(false);std::cin.tie(0)
# pragma warning(disable:4996)

struct BIT {
	vector<LL> bit;
	BIT(LL n) {
		bit.resize(n + 10);
		for (int i = 0; i < n + 10; i++)bit[i] = 0;
	}
	//[0,i)
	int sum(int i) {
		LL s = 0;
		for (int x = i - 1; x >= 0; x = (x&(x + 1)) - 1) {
			s += bit[x];
		}
		return s;
	}
	void add(int a, LL w) {
		for (int x = a; x < bit.size(); x |= x + 1) {
			bit[x] += w;
		}
	}
};

int n;
int a[303030];
int l[303030];
int r[303030];
vector<pair<LL, int>>e;

int main() {
	BIT bit(303030);
	cin >> n;
	REP(i, n) {
		cin >> a[i];
		e.emplace_back(make_pair(a[i], i));
	}
	REP(i, n) {
		cin >> l[i] >> r[i];
		e.emplace_back(make_pair(a[i] + r[i], n + i));
	}
	LL ret = 0;
	sort(ALL(e));

	REP(i, 2 * n) {
		if (e[i].second < n) {
			int x = e[i].second;
			int y = lower_bound(a, a + n, a[x] - l[x]) - a;
			ret += bit.sum(x + 1) - bit.sum(y);
			bit.add(x, 1);
		}
		else {
			bit.add(e[i].second%n, -1);
		}
	}
	cout << ret << endl;
}