import java.util.Scanner; import java.util.Arrays; import java.math.BigDecimal; public class a{ public static void main(String[] args) { Scanner sc = new Scanner(System.in); long a=sc.nextLong(); long b=sc.nextLong(); long c=sc.nextLong(); long node; node = ((a/5) * b)/c; System.out.println(node); } }