L = int(input());
N = int(input());
b = 0;
W = input().split();
for i in range(N):
    W[i] = int(W[i]);
W.sort();
for i in range(N):
    b = b + W[i];
    if (b > L):
        print(i);
        break;
    if (b == L):
        print(i+1);
        break;
else:
    print(i+1);