#include <iostream>

using namespace std;
int main(void){
    long long A,B,C;
    cin >> A >> B >> C;  
        long long block;
        
        block = C / (A + B - 1);
            if(A > C % (A + B - 1))
            {
            cout << C - (B - 1) * block;
            }
            else
            {
                cout <<  (block + 1)* A;
            }
}