#include <bits/stdc++.h>
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define printVec(v) printf("{"); for (const auto& i : v) { std::cout << i << ", "; } printf("}\n");
#define degreeToRadian(deg) (((deg)/360)*2*M_PI)
#define radianTodegree(rad) (((rad)/2/M_PI)*360)
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
using namespace std;
using P = pair<int,int>;
using ll = long long;
const ll INF = 1LL<<60;
const int MOD = 1e9 + 7;
const int dx[4] = {1, 0, -1, 0};
const int dy[4] = {0, 1, 0, -1};

//cin.tie(0);ios::sync_with_stdio(false);
//cout << fixed << setprecision(15) << y << endl;
int main() {
  ll v, t, p; cin >> v >> t >> p;

  ll l = 0, r = INF;
  while (r - l > 1) {
    ll mid = (l + r) / 2;
    ll x = (mid - 1) - v*p;
    ll c = (v * p) + v;
    if (t <= c) {
      x -= (c / t);
      x -= (c % t + c / t) / t;
      if (x <= v) l = mid;
      else r = mid;
    } else {
      if (x <= v) l = mid;
      else r = mid;
    }
  }

    cout << l << endl;
    return 0;
  }