#!/usr/bin/perl -w

$P = 1;		# probability of no common birthday
print "\n This computes the probability that in a group of N people, at least
two have the same birthday.  
\n\tEnter your choice of N here:  ";
$N = <STDIN>;
chomp($N);                                                                   

for ($K=0; $K < $N; $K++) {
	$P =$P*(1 - $K/365);
	$k = $K+1;
	$Q = sprintf("%.2f", 1 - $P);	# probability of a common birthday
print "With $k people, there is a probability  $Q of a common birthday.\n";
#	if (($k % 5) == 0) {print "  $k   $Q\n";}
}