def main():
    import sys

    # Read input
    k, n, *rest = map(int, sys.stdin.read().split())
    a = rest[:n]

    # Sort the list
    a.sort()

    # Iterate through the sorted list
    for i, value in enumerate(a):
        k -= value
        if k < 0:
            print(i)
            return

    # If all elements are used
    print(n)

if __name__ == "__main__":
    main()