<?php

$nums = trim(fgets(STDIN));
$min_value = 0;
$min_text = "";
$min_base = 0;
for ( $i=0; $i<$nums; $i++ ) {
	$input = trim(fgets(STDIN));
	$base = get_base($input);
	$value = base_convert($input, $base, 10);
	if ( ($i == 0) || ($min_value > $value) ) {
		$min_value = $value;
		$min_text = $input;
		$min_base = $base;
	}
}
$min_text_len = strlen($min_text);
$gmp_num = gmp_init(0);
for ( $i=0; $i<$min_text_len; $i++ ) {
	$text = substr($min_text, 0, 1);
	$min_text = substr($min_text, 1);
	$gmp_num = gmp_mul($gmp_num, gmp_init($min_base));
	$gmp_num = gmp_add($gmp_num, gmp_init(base_convert($text, $min_base, 10)));
}
echo gmp_strval($gmp_num).PHP_EOL;

function get_base ( $string ) {
	$count = count_chars($string,1);
	$key = ord('Z');
	while ( array_key_exists($key,$count) !== TRUE ) {
		if ( $key == ord('A') ) {
			$key = ord('9');
		}
		else {
			$key--;
		}
	}
	if ( $key >= ord('A') ) {
		$base = $key - 54;
	}
	else if ( $key >= ord('1') ) {
		$base = $key - 47;
	}
	else {
		$base = 2;
	}
	return $base;
}