#include<stdio.h>
int main(){
    int m, n;
    scanf("%d %d", &m, &n);
    printf("Invalid input");
    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 = -100000;
    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",maxRowIndex);
    return 0;
}