#include <bits/stdc++.h>
using namespace std;
long long a, b, n, dig, m = 0;
int main()
{
freopen("SOTHUC.inp", "r", stdin);
freopen("SOTHUC.out", "w", stdout);
ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
cin >> a >> b >> n;
a = a % b;
for (int i = 1; i <= n; i++)
{
a = a * 10;
dig = a / b;
a = a % b;
}
cout << dig;
return 0;
}
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