const row = require('fs').readFileSync('/dev/stdin','utf8').split('\n');

const boxWidth = Number(row[0]);
const blocks = Number(row[1]);
const blocksWidth = row[2].split(' ').map(e => Number(e)).sort((a,b) => {
    return a-b});
let count=0;
let sum=0;
while(sum < boxWidth) {
    sum += blocksWidth[count];
    if(sum > boxWidth) {
        break;
    }
    count += 1;
}

console.log(count);