#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\n", maxRowIndex);
    return 0;
 }