# coding: UTF-8

def main():
    L = int (input())
    _ = int(input())
    boxes = sorted([int(box) for box in input().split()])
    # print("boxes -> ")
    # print(boxes)

    i = 0
    for box in boxes:
        L -= box
        if L >= 0:
            i += 1
        else:
            break

    print(i)

if __name__ == "__main__":
    main()