#include<stdio.h>
int main()
{
	int arr[10][2] = {0};
	int i = 0,j = 0;
	int day = 0;
	for (i = 0; i < 7; i++)
	{
		for (j = 0; j < 2; j++)
		{
			scanf("%d", &arr[i][j]);
		}
	}
	j = 0;
	int max = 0,count =0;
	for (i = 0; i < 7; i++)
	{
		if (arr[i][0] + arr[i][1] > 8)
		{
			j++;
			count++;
		}
		else
		{
			count = 0;
			j = 2;
		}
		if (j == 1 || count > max)
		{
			max = count;
			day = i + 1;
		}
	}
	if (day == 0)
		printf("0");
	else
		printf("%d", day);
	return 0;
}