a = input()
b = input()
c = input().split()
d = [int(i) for i in c]
d.sort()
sums = 0
count = 0
for i in d:
    sums += i
    if sums < int(a):
        count += 1
        continue
    elif sums == int(a):
        count += 1
        break
    elif sums > int(a):
        break
print(count)