#include<stdio.h>
int main()
{
	int a; int b;
	int i = 1;
	int j = 1;
	int max=0;
	int maxday;
	int post[10] = { -1 };
	for (i = 1; i < 8; i++)
	{
		scanf("%d %d", &a, &b);
		post[i] = a + b;
		if (post[i] > post[i - 1])
			maxday = i;

	};
	for (j = 1; j <= 7; j++)
	{                       
		if (post[j] > 8)
			max = max + 1;
	}
	if (0 == max)
		maxday = 0;
	printf("%d", maxday);
	return 0;
}