#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++) {
            maxRowIndex = -1;
            for(int j = 0; j < n; j++) {
                rowSum += matrix[i][j];
            }
            if(rowSum > maxSum) {
                maxSum = rowSum;
                maxRowIndex = i;
            }
        }
    
    printf("%d\n", maxRowIndex);
    return 0; 
    

}