import sys

a = [input() for l in range(3)]

wide = int(a[0])
num = int(a[1])
blk = a[2].split()

blk.sort()

total = 0
for i in range(int(num)):
    total = total + int(blk[i])
    if total > wide:
        print(i)
        break
    elif total == wide:
        print(i + 1)
        break