<?php

class Paiza {
    protected function getInput() {
        $array = [];
        while ($line = fgets(STDIN)) {
            if ($line !== '') {
                $array[] = trim($line);
            }
        }
        $input = [];
        foreach ($array as $key => $value) {
            $input[] = explode(" ", $value);
        }
        return $input;
    }
    protected function println($str) {
        echo $str."\n";
    }
}

class B046 extends Paiza {
    private $circles;
    private $circle_from;
    private $direction_from;
    private $circle_to;
    private $direction_to;

    public function __construct() {
        $input = parent::getInput();

        $this->circles = $input[0][0];
        $this->circle_from = $input[1][0];
        $this->direction_from = $input[1][1];
        $this->circle_to = $input[2][0];
        $this->direction_to = $input[2][1];
    }

    public function main() {
        if ($this->direction_from === $this->direction_to) {
            parent::println(abs($this->circle_from - $this->circle_to) * 100);
            exit;
        }
        if (preg_match('/^(NS|SN|WE|EW)$/', $this->direction_from.$this->direction_to)) {
            parent::println(abs($this->circle_from + $this->circle_to) * 100);
            exit;
        } else {
            $circle_outer = max($this->circle_from, $this->circle_to);
            $circle_inner = min($this->circle_from, $this->circle_to);
            $distances = [];
            for ($r = $circle_inner; $r <= $circle_outer; $r++) {
                $distances[] = ($r * 100 * M_PI / 2) + abs($this->circle_from - $this->circle_to) * 100;
            }
            parent::println(min($distances));
            exit;
        }
    }
}

$b046 = new B046();
$b046->main();