import java.util.*;

public class No5 {
    public static void main (String[] args){
        int L, N;
        Scanner sc = new Scanner(System.in);

        L = sc.nextInt();
        N = sc.nextInt();
        int[] W = new int[N + 1];
        int i;
        for(i = 0 ; i < N ; i++){
                W[i] = sc.nextInt();
        }

        L -= W[i];
        while(L >= 0){
                i--;
                L -= W[i];
        }

        System.out.println(N - i - 1);
    }
}