#include <bits/stdc++.h>
#define rep(i,a,n) for(int i=a;i<n;i++)
#define repr(i,a,n) for(int i=a;i>=n;i--)
#define INF 999999999
#define INF_M 2147483647
#define pb(a) push_back(a)
using namespace std;
typedef pair<int, int> pii;
typedef long long int ll;

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