#include<iostream>
using namespace std;
int main (){
	int x,m,s,z=0,d=0;
	for(int i=1;i<=7,i++;){
		s=x+m;
		cin>>x>>m;
		if(s>z&&s>8) s=z,d=i;
	}
	cout<<d;
	return 0;
}