#include <string>
#include <cstdio>
#include <cstring>
#include <cmath>
#include <vector>
#include <queue>
#include <set>
#include <utility>
#include <algorithm>
#include <numeric>
#include <iostream>
#include <iterator>
#include <sstream>

using namespace std;

int main()
{
	int a,b,n;
	while(cin>>a>>b>>n){
		int ans = 0;
		a %= b;
		for (int i = 0; i < n; i++){
			a *= 10;
			ans += a / b;
			a %= b;
		}
		cout << ans <<endl;
	}
	return 0;
}