L = int(raw_input())
N = int(raw_input())
W = map(int, raw_input().split(' '))
W.sort()
SUM = 0
RESULT = 0
for i in range(N):
    SUM += W[i]
    if L < SUM:
        print(str(i))
        quit()
    if L == SUM:
        print(str(i + 1))
        quit()
print(str(N))