#include<stdio.h>
#include <math.h>
int main() 
{
     int s1,h1;
     int s2,h2;
     int s3,h3;
     int s4,h4;
     int s5,h5;
     int s6,h6;
     int s7,h7;
    scanf("%d %d\n%d %d\n%d %d\n%d %d\n%d %d\n%d %d\n%d %d\n",&s1,&h1,&s2,&h2,&s3,&h3,&s4,&h4,&s5,&h5,&s6,&h6,&s7,&h7);
    if(s1+h1>8) 	printf("1");
	else if(s2+h2>8) 	printf("2");
	else if(s3+h3>8) 	printf("3");
	else if(s4+h4>8) 	printf("4");
	else if(s5+h5>8) 	printf("5");
	else if(s6+h6>8) 	printf("6");
	else if(s7+h7>8) 	printf("7");
	else printf("0");
    return 0;
}