#include<bits/stdc++.h>
#define int long long
using namespace std;
signed main()
{
    int w[7];
    for(int i=1;i<=7;++i)
    {
        int x,y;
        cin>>x>>y;
        w[i]=x+y;
        if(w[i]<=8)w[i]=-1;
    }
    int min=100;
    for(int i=1;i<=7;++i)
        for(int j=1;j<=7-i;++j)
            if(w[j]<=w[j+1])
            {
                if(w[j]<min&&w[j]>=0)    
                    min=w[j];
            }
            else 
                if(w[j+1]<min&&w[j+1]>0)
                    min=w[j+1];
    int cnt=0;
    for(int i=1;i<=7;++i)
    {
        if(w[i]<0) cnt++;
        if(w[i]==min)
        {
            cout<<i;
            break;
        }
    }
    if(cnt==7)
        cout<<0;
    return 0;
}