import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.NoSuchElementException;
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();
		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));
	}

	class Scanner {
		private final InputStream in = System.in;
		private final byte[] buffer = new byte[1024];
		private int ptr = 0;
		private int buflen = 0;

		private boolean hasNextByte() {
			if (ptr < buflen) {
				return true;
			} else {
				ptr = 0;
				try {
					buflen = in.read(buffer);
				} catch (IOException e) {
					e.printStackTrace();
				}
				if (buflen <= 0) {
					return false;
				}
			}
			return true;
		}

		private int readByte() {
			if (hasNextByte())
				return buffer[ptr++];
			else
				return -1;
		}

		private boolean isPrintableChar(int c) {
			return 33 <= c && c <= 126;
		}

		public boolean hasNext() {
			while (hasNextByte() && !isPrintableChar(buffer[ptr]))
				ptr++;
			return hasNextByte();
		}

		public String next() {
			if (!hasNext())
				throw new NoSuchElementException();
			StringBuilder sb = new StringBuilder();
			int b = readByte();
			while (isPrintableChar(b)) {
				sb.appendCodePoint(b);
				b = readByte();
			}
			return sb.toString();
		}

		public long nextLong() {
			if (!hasNext())
				throw new NoSuchElementException();
			long n = 0;
			boolean minus = false;
			int b = readByte();
			if (b == '-') {
				minus = true;
				b = readByte();
			}
			if (b < '0' || '9' < b) {
				throw new NumberFormatException();
			}
			while (true) {
				if ('0' <= b && b <= '9') {
					n *= 10;
					n += b - '0';
				} else if (b == -1 || !isPrintableChar(b)) {
					return minus ? -n : n;
				} else {
					throw new NumberFormatException();
				}
				b = readByte();
			}
		}

		public int nextInt() {
			long nl = nextLong();
			if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE)
				throw new NumberFormatException();
			return (int) nl;
		}

		public double nextDouble() {
			return Double.parseDouble(next());
		}
	}
}