// sarkany.cpp : This file contains the 'main' function. Program execution begins and ends there.
//
#include <iostream>
#include <cmath>
#define ll long long
using namespace std;
ll T, a, b, n;
int main()
{
T = 3;
while (T--)
{
cin >> a >> b >> n;
ll sz = a * b;
ll r = a % b;
while (r)
{
a = b;
b = r;
r = a % b;
}
sz /= b;
ll szj = sz,db=0;
while (szj)
{
szj /= 10;
db++;
}
if (db <= n)
{
cout << sz;
for (int i = db; i < n; ++i)cout << '0';
}
else cout << "-1";
cout << "\n";
}
return 0;
}
// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
// Debug program: F5 or Debug > Start Debugging menu
// Tips for Getting Started:
// 1. Use the Solution Explorer window to add/manage files
// 2. Use the Team Explorer window to connect to source control
// 3. Use the Output window to see build output and other messages
// 4. Use the Error List window to view errors
// 5. Go to Project > Add New Item to create new code files, or Project > Add Existing Item to add existing code files to the project
// 6. In the future, to open this project again, go to File > Open > Project and select the .sln file