#include<iostream>
#include<string>
#include<iomanip>
#include<cmath>
#include<vector>
#include<algorithm>
#include<utility>

using namespace std;

#define int long long
#define endl "\n"

constexpr long long INF = (long long)5e18;
constexpr long long MOD = 1'000'000'007; 

struct fast_io {
	fast_io(){
		std::cin.tie(nullptr);
		std::ios::sync_with_stdio(false);
	};
} fio;

int V, T, P;

int check(int t){
	if(t <= (P + 1) * V + (t - 1)/T + 1) return true;
	
	return false;
}
	
signed main(){
	cout<<fixed<<setprecision(10);
	
	
	cin>>V>>T>>P;
	
	int l = 1, h = INF, m;

	
	while(l+1 < h){
		m = (l + h) / 2;
		
		if(check(m)) {
			l = m;
		} else {
			h = m;
		}
	}
	
	cout<<l<<endl;
	// cout<<(V+V/T) * (P+1)<<endl;
	
	
	return 0;
}