import java.util.Scanner; public class Main { public static void main(String[] args){ Scanner sc = new Scanner(System.in); System.out.print(GetUglyNumber(sc.nextInt())); sc.close(); } public static int GetUglyNumber(int index) { if(index<=6) return index; int[] arr=new int[index]; arr[0]=1; int t2=0,t3=0,t5=0; for(int i=1;i<index;i++){ arr[i]=(Math.min(arr[t2]*2,Math.min(arr[t5]*5,arr[t3]*3))); if(arr[i]==arr[t2]*2) t2++; if(arr[i]==arr[t3]*3) t3++; if(arr[i]==arr[t5]*5) t5++; } return arr[index-1]; } }