#include<iostream>
#include<iomanip>
#include<algorithm>
#include<cmath>
using namespace std;

int main(){
    int a,b,n;
    cin >> a >> b >> n;
    double jg = double(a)/b;
    for(int i = 0;i<n;i++) jg *= 10;
    cout << int(jg) % 10;
    return 0;
}