<?php
$n = trim( fgets( STDIN ) );
$m = trim( fgets( STDIN) );
$ms = explode( " ", trim( fgets( STDIN ) ) );
$i = 0;
    sort($ms);
    foreach( $ms as $key => $val){
       $n -= $val;           
       if( $n < 0 ){
            break;
       }else{
            $i++;
       }
    }
    echo $i;