<?php
$n = trim(fgets(STDIN));
$p = trim(fgets(STDIN));
$count = $p;

if ($n >= 200) {
    echo 1;
}elseif ($n < 200 && $n >1) {
    for ($i = 1; $i < $n; $i++) {
         $s = (1-$p)*pow($p,$i);
         $count += $s;
    }echo $count;
}else {
    echo $p;
}


?>