#include <iostream>
#include <vector>
#include <list>
#include <algorithm>
#include <string>
#include <stack>
#include <iomanip>
#include <numeric>
#include <queue>
#include <climits>
#include <complex>
#include <cmath>
#include <map>
using namespace std;
using ll = long long;
#define MOD 1000000007
#define INF 1LL << 59

int main()
{
    std::ios::sync_with_stdio(false);
    std::cin.tie(0);
    //cout << fixed << setprecision(3);

    int a, b, n;
    while (scanf("%d %d %d", &a, &b, &n) != EOF)
    {
        int ans = 0;
        while (n--)
        {
            a *= 10;
            ans += (a / b) % 10;
            a %= b;
        }
        cout << ans << endl;
    }
    return 0;
}
