#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 maxsun = -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\n", maxRowIndex);
return 0;
}