Assume that a, b, and n are all positive integers. Let f (i) be the i-th fraction of the fraction a / b (0 ≤ f (i) ≤ 9). At this time, let s be the sum of f (i) from i = 1 to n.

s = f (1) + f (2) + ... + f (n)


Create a program that reads a, b, n, outputs s, and exits.



Input

The input consists of multiple datasets. For each dataset, three integers a (1 ≤ a ≤ 1000), b (1 ≤ b ≤ 10000), n (1 ≤ n ≤ 100) are given on one line, separated by blanks.

The number of datasets does not exceed 100.

Output

Prints s on one line for each dataset.

Example

Input

1 2 3
2 3 4
5 4 3
4 3 2


Output

5
24
7
6
import java.util.*;
import java.io.*;

public class Main {

	public static void main(String[] args) throws IOException {
		
		BufferedReader br = 
			new BufferedReader(new InputStreamReader(System.in));
		StringTokenizer st;
		
		while (true) {
			
			String s = br.readLine();
			if (s == null) break;
			
			st = new StringTokenizer(s," ");
			int a = Integer.parseInt(st.nextToken());
			int b = Integer.parseInt(st.nextToken());
			int n = Integer.parseInt(st.nextToken());
			int ret = 0;
			
			String str = String.valueOf((double)a / b).substring(2);
			
			int lim = Math.min(str.length(), n);
			
			for (int i = 0; i < lim; i++) {
				
				ret += str.charAt(i) - '0';
				
			}
			
			System.out.println(ret);
			
		}

	}

}