代码如下：

#include <bits/stdc++.h>

using namespace std;

int s[7], maxn;

int main()
{
    for (int i = 0; i < 7; i++)
    {
        int a, b;
        cin >> a >> b;
        s[i] = a + b;
    }

    sort(s, s + 7);
    maxn = s[6];
    if (maxn < 8)
    {
        cout << 0 << endl;
        exit(0);
    }


    for (int i = 0; i < 7; i++)
    {
        if (s[i] == maxn)
        {
            cout << i + 1 << endl;
            break;
        }
    }

    return 0;
}