#include <iostream>
#include <climits>
using namespace std;
int main()
{
int a[100][100], m, n, Pmin=INT_MAX, Pi=0;
cin >> m >> n;
for (int i=0; i<n; i++)
{
int P = 1;
for (int j=0; j<m; j++)
{
cin >> a[i][j];
P *= a[i][j];
}
if (P<Pmin)
{
Pmin = P;
Pi = i;
}
}
cout << Pi+1;
return 0;
}