#include<stdio.h>

int main() {
    int m, n;
    
    if(scanf("%d %d", &m, &n) != 2 || m <= 0 || n <= 0) {
        printf("Invalid input\n");
        return 0;
    }
    int matrix[m];
    int max_sum = -10000000;
    int max_row_index = -1;
    
    for(int i = 0; i < m; i++) {
        int current_row_sum = 0;
        for(int j = 0; j < n; j++) {
            scanf("%d", &matrix[i] [j]);
            current_row_sum += matrix[i] [j];
        }
        
        if(current_row_sum > max_sum) {
            max_sum = current_row_sum;
            max_row_index = i;
        }
    }
    
    printf("%d\n", max_row_index);
    
    return 0;
}