<?php

        $input_lines = trim(fgets(STDIN));
        $input_lines = str_replace(array("\r\n","\r","\n"), "", $input_lines);
        do {
            $tmpStr[] = $input_lines;
            $input_lines = trim(fgets(STDIN));
            $input_lines = str_replace(array("\r\n","\r","\n"), "", $input_lines);
        } while ($input_lines !== "");
        
        $max = $tmpStr[0];
        $boxes = explode(" ",$tmpStr[2]);
        sort($boxes);
        
        $tmp = 0;
        $count = count($boxes);
        for($i = 0;$i < $count;$i++){
        	$tmp += $boxes[$i];
        	if($tmp > $max){
        		break;
        	}
        }
        
        echo $i;