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
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace mondai0054
{
	class Program
	{
		static void Main(string[] args)
		{
			while( true ) {
				var	s	= Console.ReadLine();
				if( s == null ) {
					break;
				}
				var	ss	= s.Split();
				var	a	= int.Parse( ss[ 0 ] );
				var	b	= int.Parse( ss[ 1 ] );
				var	n	= int.Parse( ss[ 2 ] );
			
				var	c	= (double)a / (double)b;
				var	f1	= c.ToString() + "0000000000";
				var	f2	= f1.Substring( f1.IndexOf( '.' ) + 1, n );
				int	sum	= 0;
				for( int i = 0; i < f2.Length; i++ ) {
					sum	+= f2[ i ] - '0';
				}
				Console.WriteLine( sum );
			}
		}
	}
}