#include<bits/stdc++.h>
using namespace std;
int maxx=0;
int main()
{
int a,b,w=0;
for(int i=1;i<=7;i++){
	cin>>a>>b;
	w+=1;
	if(a+b>8&&a+b>maxx){
		maxx=w;
	}
	
}
if(maxx!=0){cout<<maxx;return 0;}
cout<<"0";

return 0;
}

WA #1 Wrong Answer.wrong answer On line 1 column 1, read 5, expected 3.

WA #2 Wrong Answer.wrong answer On line 1 column 1, read 5, expected 4.

AC #3 Accepted, 得分 10.ok accepted

WA #4 Wrong Answer.wrong answer On line 1 column 1, read 5, expected 4.

AC #5 Accepted, 得分 10.ok accepted

AC #6 Accepted, 得分 10.ok accepted

WA #7 Wrong Answer.wrong answer On line 1 column 1, read 3, expected 2.

WA #8 Wrong Answer.wrong answer On line 1 column 1, read 6, expected 2.

WA #9 Wrong Answer.wrong answer On line 1 column 1, read 6, expected 2.

WA #10 Wrong Answer.wrong answer On line 1 column 1, read 6, expected 2.

WA #11 Wrong Answer.wrong answer On line 1 column 1, read 5, expected 4.

AC #12 Accepted, 得分 0.ok accepted