L = int(input())
N = int(input())
w = [int(i) for i in input().split()]

table = [[0 for i in range(L+1)] for j in range(N+1)]

for l in range(L+1):
    table[N][l] = 0

i = N-1
while i >= 0:
    for l in range(L+1):
        if l < w[i]:
            table[i][l] = table[i+1][l]
        else:
            table[i][l] = max(table[i+1][l], table[i+1][l-w[i]] + 1)
    i = i - 1
    
print(table[0][L])