aa=int(input())
bb=int(input())
cc=list(map(int,input().split(" ")))
dd=0
ee=0
ff=0
for i in range(0,bb):
  for j in range(i+1,bb):
    if cc[i]>cc[j] :
      dd=cc[i]
      cc[i]=cc[j]
      cc[j]=dd
for i in range(0,bb):
  ee+=cc[i]
  if ee<aa:
    ff+=1
  else:
    break
print(ff)