width = int(input())
N = int(input())
bl = list(map(int, input().split()))
bl.sort()
bs = 0
if sum(bl) == width:
    print(len(bl))
    exit()
for i in range(N):
    if bs + bl[i] <= width:
        bs += bl[i]
    else:
        print(i)
        exit()