package q4xx;

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

public class Q425R {
	InputStream is;
	PrintWriter out;
	String INPUT = "400\r\n" + 
			"15022680 12\r\n" + 
			"17414387 9\r\n" + 
			"14365202 12\r\n" + 
			"8600582 11\r\n" + 
			"12843553 11\r\n" + 
			"21438996 7\r\n" + 
			"18587559 7\r\n" + 
			"26031859 4\r\n" + 
			"22034856 9\r\n" + 
			"12026269 11\r\n" + 
			"9046254 11\r\n" + 
			"7354782 15\r\n" + 
			"30489020 0\r\n" + 
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			"15307151 8\r\n" + 
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			"33766144 3\r\n" + 
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			"3851566 18\r\n" + 
			"15790342 8\r\n" + 
			"4874563 15\r\n" + 
			"18917065 8\r\n" + 
			"1263463 17\r\n" + 
			"4101388 18\r\n" + 
			"23815712 6\r\n" + 
			"17989892 8\r\n" + 
			"8641586 12\r\n" + 
			"653210 15\r\n" + 
			"20220011 8\r\n" + 
			"22408618 7\r\n" + 
			"";
	
	void solve()
	{
		int n = ni();
		int[][] co = new int[n][];
		for(int i = 0;i < n;i++){
			co[i] = na(2);
		}
		long x = goldenSectionMethod(1, 10000000000L, co);
		long v = f(x, co);
		if(v > f(x+1, co)){
			x++;
			v = f(x+1, co);
		}
		if(v > f(x+2, co)){
			x++;
			v = f(x+2, co);
		}
		out.println(x);
	}
	
	public static long goldenSectionMethod(long low, long high, int[][] co)
	{
		final double tau = (Math.sqrt(5)-1)/2;
		long nl = Math.round(high + tau * (low - high));
		long nh = Math.round(low + tau * (high - low));
		long vl = f(nl, co);
		long vh = f(nh, co);
		while(high - low > 2){
//			tr(low, nl, nh, high);
//			tr(f(low, co), f(nl, co), f(nh, co), f(high, co));
//			tr();
			if(vl <= vh){
				high = nh;
				vh = vl;
				nh = nl;
				nl = Math.round(high + tau * (low - high));
				if(nl == nh)nl--;
				vl = f(nl, co);
			}else{
				low = nl;
				vl = vh;
				nl = nh;
				nh = Math.round(low + tau * (high - low));
				if(nh == nl)nh++;
				vh = f(nh, co);
			}
		}
		return low;
	}
	
	public static long f(long x, int[][] co)
	{
		long max = 0, min = Long.MAX_VALUE;
		for(int[] c : co){
			long v = c[0] + c[1] * x;
			if(v > max)max = v;
			if(v < min)min = v;
		}
		return max-min;
	}
	
	void run() throws Exception
	{
		is = INPUT.isEmpty() ? System.in : new ByteArrayInputStream(INPUT.getBytes());
		out = new PrintWriter(System.out);
		
		long s = System.currentTimeMillis();
		solve();
		out.flush();
		if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms");
	}
	
	public static void main(String[] args) throws Exception { new Q425R().run(); }
	
	private byte[] inbuf = new byte[1024];
	private int lenbuf = 0, ptrbuf = 0;
	
	private int readByte()
	{
		if(lenbuf == -1)throw new InputMismatchException();
		if(ptrbuf >= lenbuf){
			ptrbuf = 0;
			try { lenbuf = is.read(inbuf); } catch (IOException e) { throw new InputMismatchException(); }
			if(lenbuf <= 0)return -1;
		}
		return inbuf[ptrbuf++];
	}
	
	private boolean isSpaceChar(int c) { return !(c >= 33 && c <= 126); }
	private int skip() { int b; while((b = readByte()) != -1 && isSpaceChar(b)); return b; }
	
	private double nd() { return Double.parseDouble(ns()); }
	private char nc() { return (char)skip(); }
	
	private String ns()
	{
		int b = skip();
		StringBuilder sb = new StringBuilder();
		while(!(isSpaceChar(b))){ // when nextLine, (isSpaceChar(b) && b != ' ')
			sb.appendCodePoint(b);
			b = readByte();
		}
		return sb.toString();
	}
	
	private char[] ns(int n)
	{
		char[] buf = new char[n];
		int b = skip(), p = 0;
		while(p < n && !(isSpaceChar(b))){
			buf[p++] = (char)b;
			b = readByte();
		}
		return n == p ? buf : Arrays.copyOf(buf, p);
	}
	
	private char[][] nm(int n, int m)
	{
		char[][] map = new char[n][];
		for(int i = 0;i < n;i++)map[i] = ns(m);
		return map;
	}
	
	private int[] na(int n)
	{
		int[] a = new int[n];
		for(int i = 0;i < n;i++)a[i] = ni();
		return a;
	}
	
	private int ni()
	{
		int num = 0, b;
		boolean minus = false;
		while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'));
		if(b == '-'){
			minus = true;
			b = readByte();
		}
		
		while(true){
			if(b >= '0' && b <= '9'){
				num = num * 10 + (b - '0');
			}else{
				return minus ? -num : num;
			}
			b = readByte();
		}
	}
	
	private long nl()
	{
		long num = 0;
		int b;
		boolean minus = false;
		while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'));
		if(b == '-'){
			minus = true;
			b = readByte();
		}
		
		while(true){
			if(b >= '0' && b <= '9'){
				num = num * 10 + (b - '0');
			}else{
				return minus ? -num : num;
			}
			b = readByte();
		}
	}
	
	private static void tr(Object... o) { System.out.println(Arrays.deepToString(o)); }
}