chomp(my $n =  <STDIN>);
chomp(my ($a, $b, $c) =  split " ", <STDIN>);

my $ans = int($n / $a) + int($n / $b) + int($n / $c);
my $mi = int($n / lcm($a,$b)) + int($n / lcm($b,$c)) + int($n / lcm($a,$c));
my $pu = int($n / lcm(lcm($a,$b),$c));

$ans = $ans - $mi + $pu;
print "$ans\n";

sub gcd {
    my ($a, $b) = @_;
    $b == 0 ? $a : gcd($b, $a % $b);
}

sub lcm {
    my ($a, $b) = @_;
    $a * $b / gcd($a, $b);
}