백준 17496 Java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Q17496 {

	public static void main(String[] args) throws IOException {
		BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
		String s = bf.readLine();
		StringTokenizer st = new StringTokenizer(s);
		int n = Integer.parseInt(st.nextToken());
		int t = Integer.parseInt(st.nextToken());
		int c = Integer.parseInt(st.nextToken());
		int p = Integer.parseInt(st.nextToken());
		
		System.out.println((n-1)/t*c*p);

	}

}