#include <iostream>
#include <algorithm>
#include <string>
#include <vector>
#include <math.h>

using ll = long long;
using namespace std;

const int MOD = 1e9+7;

int main() {
    ll A, B, C, D;
    cin >> A >> B >> C;
    D = A+B-1;
    if (C > C / D * D + A - 1) {
        cout << (C / D + 1) * A << endl;
    }
    else {
        cout << C / D * A + C % D << endl;
    }
    return 0;
}