import java.util.*;

class Main{
    public static void main(String args[]){
        Scanner sc = new Scanner(System.in);
        int L = sc.nextInt();
        int N = sc.nextInt();
        int a[] = new int[N];
        for(int i = 0; i < N; i++){
          a[i] = sc.nextInt();
        }
        for(int i = 0; i < N; i++){
          L -= a[i];
          if(L <= 0){
            System.out.println(i-1);
            return;
          }
        }
        System.out.println(N);
    }
}