#include<bits/stdc++.h>
using namespace std;
int main(){
	int n;
	cin>>n;
	int n;
	cin>>n;
	int x[200];
	for(int i=1;i<=n;i++){
	for(int j=1;j<=2;j++){ 
	cin>>x[i][j];
	}
	}
	int ans;	
	for(int i=1;i<=n;i++){
		for(int j=1;j<=2;j++){
			if((a[i][j]&&a[i][j+1])>(a[i+1][j]&&a[i+1][j+1])) ans=a[i][j];
		}
	} 
	cout<<ans;
	
	
	
	
	return 0;
}

/**************************************************************
	Problem: 1057
	User: caijiajie
	Language: C++
	Result: Compile Error
****************************************************************/