function Main(input) {
  Array.prototype.swap = function (a, b) {
    var tmp = this[a]
    this[a] = this[b]
    this[b] = tmp
    return this
  }
  function quickSort(a) {
    var recurse = function (a, i, j) {
      var k, p = pivot(a, i, j)
      if (p !== -1) {
        k = partition(a, i, j, a[p])
        recurse(a, i, k - 1)
        recurse(a, k, j)
      }
      return a
    },
      pivot = function (a, i, j) {
        var k = i + 1
        while (k <= j && a[i] === a[k]) {
          k++
        }
        if (k > j) {
          return -1
        }
        if (a[i] >= a[k]) {
          return i
        }
        return k
      },
      partition = function (a, i, j, p) {
        var l = i, r = j
        while (l <= r) {
          while (l <= j && a[l] < p) {
            l++
          }
          while (r >= i && a[r] >= p) {
            r--
          }
          if (l > r) {
            break
          }
          a.swap(l++, r--)
        }
        return l
      }
    return recurse(a, 0, a.length - 1)
  }
  const data = input.trim().split("\n")
  let L = parseInt(data[0])
  let N = parseInt(data[1])
  let blocks = data[2].split(" ").map(block => parseInt(block))
  let sum = 0
  blocks = quickSort(blocks)
  for (let i = 0; i < blocks.length; i++) {
    sum += blocks[i]
    if(L < sum) {
      console.log(i)
      return
    }
  }
  console.log(N)
}
Main(require("fs").readFileSync("/dev/stdin", "utf8"))