#include <stdio.h>

int main()
{
    int days[7][2],x,y,i,sum[7],a,b,temp;
    int gaoxing=1;
    for ( i = 0; i < 7; i++)
    {
        for ( x = 0,y=1; x < 1,y<2; x++,y++)
        {
            scanf("%d %d",&days[i][x],&days[i][y]);
        }
    }
    for ( i = 0; i < 7; i++)
    {
        for ( x = 0,y=1; x < 1,y<2; x++,y++)
        {
            a=days[i][x];
            b=days[i][y];
            sum[i]=a+b;
        }
        
    }
    for ( i = 0; i < 7; i++)
    {
        if (sum[i]<8)
        {
            gaoxing++;
        }
        
    }
    if (gaoxing==7)
    {
        printf("0");
        return 0;
    }
    
    
    int max=8;
    for ( i = 0; i < 7; i++)
    {
        if (sum[i]>=8)
        {
            if (sum[i]>max)
            {
                temp =i+1;
                max=sum[i];
            }
            
        }
        
    }
    
    printf("%d",temp);
}