#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;
}