package ST;

import java.util.Scanner;

/**

* @auther: WJoe

* @Description:

* @Date : 19:52 2018/9/7

*/

public class Main3 {

public static void main(String[] args) {

Scanner scanner = new Scanner(System.in);

int n = scanner.nextInt();

int[][] ints = new int[2][n];

int max = Integer.MIN_VALUE;

int maxindex = 0;

for (int i = 0; i < n; i++) {

ints[0][i] = scanner.nextInt();

ints[1][i] = scanner.nextInt();

if (ints[0][i] > max) {

max = ints[0][i];

maxindex = i;

}

}

System.out.println(max);

}

}