#fileencoding: utf-8

from __future__ import print_function
import sys

def usage():
    arg = "filename"
    print("usage: python %s %s"%(sys.argv[0], arg))
    sys.exit()

def main():
    with open(sys.argv[1]) as f:
        for i, v in enumerate(f):
            if i == 0:
                L = int(v)
            elif i == 1:
                N = int(v)
            elif i == 2:
                W = [int(j) for j in v.strip().split(" ")]
        count = 0
        for i in sorted(W):
            L -= i
            if L > 0:
                count += 1
        print(count)




if __name__ == "__main__":
    if len(sys.argv) != 2:
        usage()
    main()