import java.util.*;

public class Main {
	public static void main (String[] args) {
    	Scanner sc = new Scanner(System.in);
    	int n = sc.nextInt();
    	if (n == 0) {
    	    System.out.println("0");
    	    return;
    	}
    	StringBuilder sb = new StringBuilder("0.");
    	int base = 1;
    	for (int i = 1; i <= n; i++) {
    	    base *= 10;
    	    sb.append(base / 7);
    	    base %= 7;
    	}
    	System.out.println(sb);
	}
}