L = int(input())
N = int(input())
M = sorted(list(map(int,input().split())))
i = 0

try:
    while True:
        L -= M[i]
        if(L < 0):
            print(i)
            break
        elif(L == 0):
            print(i+1)
            break
        else:
            i+=1
except:
    print(i)