L = int(input())
N = int(input())
W_list = [int(x) for x in input().split()]

max_num = 0

W_list_ascending = sorted(W_list)

while L > 0:
    if L > W_list_ascending[0]:
        L = L - W_list_ascending[0]
        W_list_ascending.pop(0)
        max_num = max_num + 1
    else:
        break
        
print(max_num)