#include<bits/stdc++.h>
using namespace std;
int xuexiao[15];
int keyai[15];
int zhou[10];
int main()
{
	for(int i = 1 ; i <= 7 ; i++)
	{
		cin >> xuexiao[i] >> keyai[i];
		zhou[i] = xuexiao[i] + keyai[i];
	}
	bool n = false;
	int sum = 0;
	for(int i = 1 ; i <= 7 ; i++)
	{
		if(zhou[i] < 8)
		{
			sum = sum;
		}
		else
		{
			bool n = true;
			sum = zhou[i];
		}
	}
	if(n == false)
	{
		cout << 0;
	}
	else
	{
		cout << sum;
	}
}