L=int(input())
N=int(input())
W=[int(i) for i in input().split()]
W.sort(reverse=True)
S=0
i=0
for i in range(len(W)):
    S+=W[i]
#    print(S)
    i+=1
i=0
#print(L)
while S > L:
#    print(S)
    S=S-W[i]
#    print(S)
    i+=1
#print(N)
N-=i
print(N)