#include<bits/stdc++.h>
using namespace std;
int main()
{
    int a,b,n,m;
    double s;
    cin>>a>>b>>n;
    s=(double)a/(double)b;
    for(int i=1;i<=n;i++)
    {
        s=s*10;
    }
    m=int(s);
    m=m%10;
    cout<<m;
    return 0;
}