L = int(raw_input())
N = int(raw_input())
W = raw_input()
W_array = W.split()
W_array.sort()

flag = 0
i = 0
box_num =0
W_sum = 0
NUM = N-1
while i < NUM:
    if W_sum > L:
        break
    else:
    	W_sum +=int(W_array[i])
        box_num +=1
        i +=1
print  box_num