L = int(input())
N = int(input())
W = list(map(int,input().split()))
count = [0] * 10001
for i in W:
    count[i] += 1
c = 0
for i in range(1,10001):
    if count[i] != 0:
        if L < i:
            break
        else:
            q = min(L // i,count[i])
            c += q
            L = L - i * q
print(c)