using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Text;
using System.Text.RegularExpressions;
using System.Linq;
using System.IO;

class Program
{
    static void Main()
    {
        new Magatro().Solve();
    }
}

class Magatro
{

    private int A, B, T;

    private void Scan()
    {
        var line = Console.ReadLine().Split(' ');
        A = int.Parse(line[0]);
        B = int.Parse(line[1]);
        T = int.Parse(line[2]);
    }

    public void Solve()
    {
        Scan();
        int ans = int.MaxValue;
        if (A < B)
        {
            var t = A;
            A = B;
            B = t;
        }
        int l = (T + A - 1) / A;
        int aa = 0;
        for (int i = 0; i <= l; i++)
        {
            int bb = ((T - aa + B - 1) / B) * B;
            ans = Math.Min(ans, aa + bb);
            if (ans == T)
            {
                break;
            }
            aa += A;
        }
        Console.WriteLine(ans);
    }
}