<?php
	$input = [];
    while ($line = fgets(STDIN)) {
        $input[] = explode(" ", trim($line)); //各行の値を変数xに代入、保管
    }
    
    $total = 0;
    if (isset($input[1])) {
        foreach ($input[1] as $n) {
	    	$total += $n;
    	}	
    }
    
    $count = 0;
    for ($i = 0; $i <= 100; $i++) {
    	$n = $total + $i;
    	
    	if ($input[0][0] > 1) {
    		if ($n % $input[0][0] == 0) {
    			$count++;		
    		}
    	} else {
    		$count++;
    	}

    }
    echo $count;