# use strict;
# use warnings;

chomp(my $L = <>);
<>;
chomp(my $W = <>);
my @WS = split(/\s/, $W);
my $c = 0;
my $w = 0;
foreach (sort(@WS)) {
    $w += $_;
    last if $w >= $L;
    $c += 1;
}
print($c, "\n");