#include<iostream>
#include<iomanip>
#include<cmath>
#include<cstring>
using namespace std;
int main(){
    double a,b,n,s;
    cin>>a>>b>>n;
    short kg=0,l[5555];
    s=a/b;
    for(int i=1;i<=n;i++){
    	s*=10;
    	l[i]=int(s)%10;
    	double t=s-int(s);
    	s=double(int(s)%100000)+t;
	}
	cout<<l[int(n)];
}