"use strict";
function Main(input) {
    let BoxLength;
    let Blockqty;
    let Blocks;
    let j, k;
    j = 0;
    k = -1;
    BoxLength = Number(input.split("\n")[0]);
    Blockqty = Number(input.split("\n")[1]);
    Blocks = input.split("\n")[2].split(" ").map((i) => Number(i)).sort((a, b) => a - b);
    do {
        ++k;
        j += Blocks[k];
    } while (j <= BoxLength && k != Blockqty);
    console.log(k);
}
//テストの入力を受け取る
Main(require("fs").readFileSync("/dev/stdin", "utf8"));
//Main("557\n3\n171 272 52");
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