//
let L, N, W;

//
process.stdin.resume();
process.stdin.setEncoding('utf8');

process.stdin.on('data', data => {
  const arr = data.split('\n');
  L = Number(arr[0]);
  N = Number(arr[1]);
  W = arr[2].split(' ').map(x => Number(x));
});

process.stdin.on('end', () => {
  const dp = new Array(N + 1);
  for (let i = 0; i < dp.length; i++) {
    dp[i] = new Array(L + 1).fill(0);
  }
  for (let i = 0; i < N; i++) {
    for (let j = 0; j <= L; j++) {
      if (j < W[i]) {
        dp[i + 1][j] = dp[i][j];
      } else {
        dp[i + 1][j] = Math.max(dp[i][j], dp[i][j - W[i]] + 1);
      }
    }
  }
  console.log(Math.max(dp[N][L]));
});