#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 maxRowIndex = -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", maxRowIndex);
return 0;
}