java

import java.util.*;
public class UnhappyDeJingJing {
    public static void main(String args[]){
        Scanner sc=new Scanner(System.in);
        int []a=new int[7];
        int []b=new int[7];
        int []c=new int[7];
        int count=-1;
        for(int i=0;i<7;i++){
            a[i]=sc.nextInt();
            b[i]=sc.nextInt();
        }
        for(int i=0;i<7;i++){
            c[i]=a[i]+b[i];
            if(c[i]>8 && c[i]>c[i+1])
                count=i;
        }
        if(count<0)
            System.out.println('0');
        else
        {
            for(int i=0;i<7;i++){
                for(int j=0;j<7-i-1;j++){
                    int temp;
                    if(c[j]>c[j+1])
                    {
                        temp=c[j];
                        c[j]=c[j+1];
                        c[j+1]=temp;
                    }
                }
            }
            int count1=0;
            for(int i=count-1;i>=0;i--){
                if(c[i]==c[count]){
                    count1++;
                }
            }
            if(count1>0){
                System.out.println((count+1-count1));
            }
            else{
                System.out.println((count+1));
            }
        }
    }
}