#include <iostream>
using namespace std;
int main()
{
	int m,i,n,d,a,b,max;
	while(cin>>n&&n!=0){
    max=-1;
	
		for(i=1;i<=n;i++)
	{
		
		cin>>a>>b;
		
		m=a+b;
		if(m>max)
		{
			max=m;
		d=i;
		}
    

	}
		if(max>8)
      cout<<d<<endl;
		else
	   cout<<"0"<<endl;
	}
	
	return 0;
}