#include<stdio.h>
int main()
{
    int m,n;
    scanf("%d %d",&m ,&n);
    if(m <= 0 || n <= 0)
    {
        printf("Invalid input\n");
        return 0;
        }
int matrix[m][n];
for (int i=0;i<m;i++)
{
    for(int j=0;j<n;j++)
    {
        scanf("%d",&matrix[i][j]);
    }
}
int maxsum = -1000000;
int maxRowTndex = -1;
for(int i = 0; i < m; i++)
{
    int rowsum = 0;
    for (int j = 0; j < n; j++)
{
    rowsum += matrix[i][j];
}
if(rowsum > maxsum)
{
    maxsum = rowsum;
    maxRowIndex = i;
}
}
printf("%d\n",maxRowIndex);
return 0;
}