#include<iostream>
using namespace std;
int main()
{
	int a1, a2, a3;
	cin >> a1 >> a2;
	a3 = a1 + a2;
	int b1, b2, b3;
	cin >> b1 >> b2;
	b3 = b1 + b2;
	int c1, c2, c3;
	cin >> c1 >> c2;
	c3 =c1 + c2;
	int d1, d2, d3;
	cin >> d1 >> d2;
	d3 = d1 +d2;
	int e1, e2, e3;
	cin >> e1 >> e2;
	e3 = e1 + e2;
	int f1, f2, f3;
	cin >> f1 >> f2;
	f3 = f1 + f2;
	int g1, g2,g3;
	cin >> g1 >> g2;
	g3 = g1 + g2;
	int x = 0;
	if (g3 > 8) x = 7;
    if (f3 > 8) x = 6;
    if (e3 > 8) x = 5;
	if (d3 > 8) x = 4;
    if (c3 > 8) x = 3;
    if (b3 > 8) x = 2;
    if (a3 > 8) x = 1;
	cout << x;
	return 0;
}