#include<bits/stdc++.h>
using namespace std;

vector<pair<int, int>> T;
vector<pair<int, int>> res;
int main()
{
	int week = 7;
	
	while (week--)
	{
		int t1, t2; scanf("%d%d", &t1, &t2);
		T.push_back({ t1, t2 });
	}
	
	for (int i = 0; i < 7; i++)
	{
		int t = T[i].first + T[i].second;
		
		if ( t > 8) res.push_back({ i + 1, t });
	}
	
	sort(res.begin(), res.end());
	
	if (res.empty()) printf("0\n");
	else printf("%d\n", res[0].first);
	
	return 0;
}