L = int(input())
N = int(input())
A = map(int, input().split())

list_A = list(A)
list_As = sorted(list_A)

sum = 0
for i in range(N):
    sum = sum + int(list_As[i])
    #print(i, sum)
    if sum == L:
        i=i+1
        break
    elif sum > L:
        break
if sum < L:
    i=i+1
print(i)