import java.util.ArrayList;
import java.util.Arrays;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		new Main().run();
	}

	class BIT {
		int n;
		long[] v;

		public BIT(int n_) {
			n = n_;
			v = new long[n + 1];
		}

		void add(int k, long val) {
			++k;
			while (k <= n) {
				v[k] += val;
				k += k & -k;
			}
		}

		long sum(int k) {
			++k;
			k = Math.min(k, n);
			long ret = 0;
			while (k > 0) {
				ret += v[k];
				k -= k & -k;
			}
			return ret;
		}

		long sum(long a, long b) {
			return sum((int) b) - sum((int) a - 1);
		}
	}

	void run() {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		long[][] A = new long[N][3];
		for (int i = 0; i < N; ++i) {
			A[i][0] = sc.nextLong();
		}
		for (int i = 0; i < N; ++i) {
			A[i][1] = sc.nextLong();
			A[i][2] = sc.nextLong();
		}
		ArrayList<Integer>[] rm = new ArrayList[N];
		for (int i = 0; i < N; ++i)
			rm[i] = new ArrayList<>();
		BIT bit = new BIT(N);
		long ans = 0;
		for (int i = 0; i < N; ++i) {
			{// A[m][0]>=A[i][0]-A[i][1]となる最小のmを求めたい
				int ok = N - 1, ng = -1;
				while (ok - ng > 1) {
					int m = (ok + ng) / 2;
					if (A[m][0] >= A[i][0] - A[i][1]) {
						ok = m;
					} else {
						ng = m;
					}
				}
				ans += bit.sum(ok, i);
			}
			bit.add(i, 1);
			// A[m][0] <= A[i][0] + A[i][2]なる最大のmを求めたい

			{
				int ok = i, ng = N;
				while (ng - ok > 1) {
					int m = (ok + ng) / 2;
					if (A[m][0] <= A[i][0] + A[i][2]) {
						ok = m;
					} else {
						ng = m;
					}
				}
				rm[ok].add(i);
			}
			for (int v : rm[i]) {
				bit.add(v, -1);
			}
		}
		System.out.println(ans);
	}

	void tr(Object... objects) {
		System.out.println(Arrays.deepToString(objects));
	}
}