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