#include<iostream>
using namespace std;
int main()
{
	int n,a[100]={0},b[100]={0},max=0,br=0,sum=0;
	cin>>n;
	for(int i=1;i<=n;i++)
	{
	cin>>a[i]>>b[i];
	}
	max=a[1];
	for(int i=1;i<=n;i++)
	for(int j=i+1;j<=n;j++)
	{if(a[i]>max)max=a[i];
	if(b[i]==b[j]){br++;sum=a[i]+a[j];} 
	}
	if(br==0){cout<<max<<" ";}
	else
	cout<<sum;
	return 0;
}
