#include<stdio.h>
int main()
{
    int a1,b1,a2,b2,a3,b3,a4,b4,a5,b5,a6,b6,a7,b7;//a为静静，b为妈妈
    scanf("%d %d\n%d %d\n%d %d\n%d %d\n%d %d\n%d %d\n%d %d",&a1,&b2,
    &a2,&b2,&a3,&b3,&a4,&b4,&a5,&b5,&a6,&b6,&a7,&b7);
    int s1,s2,s3,s4,s5,s6,s7;//上课时间之和
    s1=a1+b1;
    s2=a2+b2;
    s3=a3+b3;
    s4=a4+b4;
    s5=a5+b5;
    s6=a6+b6;
    s7=a7+b7;
    if(s1<=8&&s2<=8&&s3<=8&&s4<=8&&s5<=8&&s6<=8&&s7<=8)
    printf("0");
    else if(s1>8)
    printf("1");
    else if(s2>8)
    printf("2");
    else if(s3>8)
    printf("3");
    else if(s4>8)
    printf("4");
    else if(s5>8)
    printf("5");
    else if(s6>8)
    printf("6");
    else if(s7>8)
    printf("7");
    return 0;
}