box=int(input())
n=int(input())
sbox=list(map(int,input().split()))

sbox.sort()
sumnum=0
for i in range(len(sbox)):
    sumnum+=sbox[i]
    if sumnum>box:
        print(i)
        break
    elif sumnum==box:
        print(i+1)
        break
print(i+1)