<?php
while ($line = fgets(STDIN)) {
	$s[] = trim($line);
}
foreach ($s as $key => $value) {
	$array[] = explode(" ", $value);
}
$lines = array_splice($array, 0, 1);

$W_counter = 0;
for ($i=0; $i<$lines[0][0]; $i++) {
    if (strpos($array[$i][0], "W") !== false) {
        $W_counter += substr_count($array[$i][0], "W");
    }
}
echo $W_counter.PHP_EOL;
?>