// No.604 誕生日のお小遣い
// https://yukicoder.me/problems/no/604
//
#include <iostream>
#include <cmath>
#include <algorithm>
using namespace std;

unsigned long long int solve(unsigned long long int A, unsigned long long int B, unsigned long long int C);


int main() {
    std::cin.tie(nullptr);
    std::ios::sync_with_stdio(false);
    
    unsigned long long A, B, C;
    cin >> A >> B >> C;
    unsigned long long ans = solve(A, B, C);
    cout << ans << endl;
}

unsigned long long int solve(unsigned long long int A, unsigned long long int B, unsigned long long int C) {
    if (A == 1) {
        unsigned long long ans = C / B;
        if (C % B != 0)
            ++ans;
        return ans;
    }
    
    unsigned long long cycle_income = B + (A - 1);
    unsigned long long cycle = C / cycle_income;
    unsigned long long ans1 = C - (cycle_income * cycle) + A * cycle;
    unsigned long long ans2 = (cycle + 1) * A;
    return min(ans1, ans2);
}