#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 = -2147483648;
    int maxRowIndex = 0;

    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;
}