function compareNumbers(a, b){
  return a-b;
}

function Main(input) {
    var data = input.split("\n")
    var L = data[0];
    var N = data[1];
    var W = data[2].split(" ");
    for(var i=0; i<W.length; ++i){
      W[i] = parseInt(W[i]);
    }
    W.sort(compareNumbers);
    var total = 0;
    while(total<L && i<N){
      total += W[i];
      ++i;
    }
    console.log(i);
}

// Don't edit this line!
Main(require("fs").readFileSync("/dev/stdin", "utf8"));