#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;
            maxE = i;
        }
    }
    printf("%d\n", maxRowIndex);
    return 0;
}