#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <cmath>
#include <string>
#include <algorithm>
#include <vector>
#include <queue>
#include <stack>
#include <functional>
#include <iostream>
#include <map>
#include <set>
using namespace std;
typedef pair<int,int> P;
typedef pair<int,P> P1;
typedef pair<P,P> P2;
#define pu push
#define pb push_back
#define mp make_pair
#define eps 1e-7
#define INF 2000000000
int main(){
	int a,b,c;
	while(scanf("%d %d %d",&a,&b,&c)!=EOF){
		a%=b;
		int ans=0;
		for(int i=0;i<c;i++){
			a*=10;
			ans+=a/b;
			a%=b;
		}
		printf("%d\n",ans);
	}
}