#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define llong long long

int main() {
    llong a, b, c;
    cin >> a >> b >> c;
    llong unit = (a-1) + b;

    llong year = c / unit * a;
    if(c % unit <= a-1) {
        year += c % unit;
    } else {
        year += a;
    }
    cout << year << endl;
}