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