<?php
$big_box = trim(fgets(STDIN));
$num_box = trim(fgets(STDIN));
$width = trim(fgets(STDIN));
$total = 0;
$number = 0;

$arr_width = explode(' ', $width);
for($i=0; $i<=$num_box; $i++){
    foreach($arr_width as $key => $value) {
        $total +=  $value;
        if($total >= $big_box){
             break;
        } else{
           $number++;
        }
    }
}
print $number;
?>