def main():
    import sys
    input = sys.stdin.read
    data = input().split()
    
    k = int(data[0])
    n = int(data[1])
    a = list(map(int, data[2:2+n]))
    
    a.sort()
    
    for i in range(n):
        k -= a[i]
        if k < 0:
            print(i)
            return
    
    print(n)

if __name__ == "__main__":
    main()