// package agc.agc023;

import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.InputMismatchException;

public class Main {
    public static void main(String[] args) {
        InputReader in = new InputReader(System.in);
        PrintWriter out = new PrintWriter(System.out);

        int n = in.nextInt();
        long s = in.nextLong();
        long[] x = new long[n];
        long[] p = new long[n];
        for (int i = 0; i < n ; i++) {
            x[i] = in.nextInt();
            p[i] = in.nextInt();
        }

        int ith = n;
        for (int i = 0; i < n ; i++) {
            if (s < x[i]) {
                ith = i;
                break;
            }
        }

        int l = 0;
        int r = n-1;
        long dist = 0;
        int last = 2;
        while (true) {
            if (ith <= l || r < ith)  {
                dist += x[r] - x[l];
                if (ith <= l) {
                    dist += x[l] - s;
                } else {
                    dist += s - x[r];
                }
                break;
            }

            if (p[l] >= p[r]) {
                p[l] += p[r];
                if (last != 0) {
                    dist += x[r] - x[l];
                }
                last = 0;
                r--;
            } else {
                p[r] += p[l];
                if (last != 1) {
                    dist += x[r] - x[l];
                }
                last = 1;
                l++;
            }

        }
        out.println(dist);
        out.flush();
    }

    public static void debug(Object... o) {
        System.err.println(Arrays.deepToString(o));
    }

    public static class InputReader {
        private static final int BUFFER_LENGTH = 1 << 12;
        private InputStream stream;
        private byte[] buf = new byte[BUFFER_LENGTH];
        private int curChar;
        private int numChars;

        public InputReader(InputStream stream) {
            this.stream = stream;
        }

        private int next() {
            if (numChars == -1) {
                throw new InputMismatchException();
            }
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                }
                if (numChars <= 0)
                    return -1;
            }
            return buf[curChar++];
        }

        public char nextChar() {
            return (char) skipWhileSpace();
        }

        public String nextToken() {
            int c = skipWhileSpace();
            StringBuilder res = new StringBuilder();
            do {
                res.append((char) c);
                c = next();
            } while (!isSpaceChar(c));
            return res.toString();
        }

        public int nextInt() {
            return (int) nextLong();
        }

        public long nextLong() {
            int c = skipWhileSpace();
            long sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = next();
            }
            long res = 0;
            do {
                if (c < '0' || c > '9') {
                    throw new InputMismatchException();
                }
                res *= 10;
                res += c - '0';
                c = next();
            } while (!isSpaceChar(c));
            return res * sgn;
        }

        public double nextDouble() {
            return Double.valueOf(nextToken());
        }

        int skipWhileSpace() {
            int c = next();
            while (isSpaceChar(c)) {
                c = next();
            }
            return c;
        }

        boolean isSpaceChar(int c) {
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }
    }
}

Measured memory_bytes: 26068