#include<iostream>

using namespace std;

int main()
{
	int a[7][2];
	int b[7];
	int t = 0;
	int m = 0;
	int n = 0;
	for (int i = 0; i < 7; i++)
	{
		for (int j = 0; j < 2; j++)
			cin >> a[i][j];
	}
	for (int i = 0; i < 7; i++)
	{
		b[i] = a[i][0] + a[i][1];
		if (b[i] >= 8)
			t++;
	}
	m =b[0];
	for (int i = 0; i < 7; i++)
	{
		if (b[i]>m)
		{
			m = b[i];
			n = i;
		}
	}
	if (t == 0)
		cout << 0;
	else
		cout << n + 1;	
}