#include<stdio.h>
int main(){
    int m,n;
    if(scanf("%d %d",&m,&n)!=2||m<=0||n<=0){
        printf("Invalid input");
        return 0;
    }
    int i,j;
    int matrix[m][n];
    int maxSum=-1000000;
    int maxIndex=-1;
    for(int i=0;i<m;i++){
        int rowSum=0;
        for(int j=0;j<n;j++)
        if(scanf("%d",&matrix[i][j])!=1||matrix[i][j]<-100||matrix[i][j]>100)
        {
            printf("Invalid input");
            return 0;
        }
        rowSum+=matrix[i][j];
    }
    int rowSum;
    if(rowSum>maxSum){
        maxSum=rowSum;
        maxRow=i;
    }
printf("%d\n",maxRow);
return 0;
}