#include <iostream>
#include <algorithm>
#include <iomanip>
#include <vector>
#include <queue>
#include <set>
#include <map>

using namespace std;
typedef long long ll;

ll V, T, P;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout << setprecision(10) << fixed;
    cin >> V >> T >> P;
    ll ans = (P+1)*V;
    ll rem = (P+1)*V;
    while(true){
        ll m = rem/T;
        ans += m;
        rem = m+rem%T;
        if(rem < T) break;
    }
    cout << ans+1 << endl;
}