import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.Scanner;

class Main {
	public static void main(String[] args) {
		new Main().run();
	}
	
	long f(long[] A,long[] B,long x) {
		int n=A.length;
		long INF=Long.MAX_VALUE;
		long ret=INF,max=-INF,min=INF;
		for(int i=0;i<n;++i) {
			max=Math.max(max, A[i]+B[i]*x);
			min=Math.min(min, A[i]+B[i]*x);
		}
		return max-min;
	}
	
	void run() {
		Scanner sc=new Scanner(System.in);
		int N=sc.nextInt();
		long[] A=new long[N];
		long[] B=new long[N];
		for(int i=0;i<N;++i) {
			A[i]=sc.nextLong();
			B[i]=sc.nextLong();
		}
		//f(left)>f(left+1)
		//f(right)<=f(right+1)
		long left=0,right=(long)1e9;
		while(right-left>1) {
			long middle=(right+left)/2;
			if(f(A,B,middle)<=f(A,B,middle+1)) {
				right=middle;
			}else {
				left=middle;
			}
		}
		System.out.println(right);
	}
	
	static void tr(Object... objects) {
		System.out.println(Arrays.deepToString(objects));
	}

}