#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;
        }
    }
    printdf("%d\n", maxrowindex);
    return 0;
}