L = int(input())
N = int(input())
A = input()
a = A.split()
for i in range(0,N):
    a[i] = int(a[i])
s = 0
t = 0

while s < L:
    m = min(a)
    if s + m <= L:
        s = s + m
        del a[a.index(m)]
        t += 1
    else:
        break

print(t)