#include "bits/stdc++.h"
using namespace std;

#define DEBUG(x) cout<<#x<<": "<<x<<endl;
#define DEBUG_VEC(v) cout<<#v<<":";for(int i=0;i<v.size();i++) cout<<" "<<v[i]; cout<<endl

typedef long long ll;
#define vi vector<int>
#define vl vector<ll>
#define vii vector< vector<int> >
#define vll vector< vector<ll> >
#define vs vector<string>
#define pii pair<int,int>
#define pis pair<int,string>
#define psi pair<string,int>
const int inf = 1000000001;
const ll INF = 1e16;
#define MOD 1000000007
#define mod 1000000009
#define pi 3.14159265358979323846
#define Sp(p) cout<<setprecision(15)<<fixed<<p<<endl;
int dx[4] = { 1,0,-1,0 }, dy[4] = { 0,1,0,-1 };
int dx2[8] = { 1,1,0,-1,-1,-1,0,1 }, dy2[8] = { 0,1,1,1,0,-1,-1,-1 };

int main() {
  ll a, b, c;
  cin >> a >> b >> c;
  ll k = (a - 1 + b);
  ll m = (c - 1) / k;
  ll sum = m * k;
  ll year = m * a;
  ll nokori = c - sum;
  if (nokori < a) {
    cout << year + nokori << endl;
    return 0;
  }
  else {
    nokori -= (a - 1 + b);
    year += a;
    if (nokori <= 0) {
      cout << year << endl;
      return 0;
    }else{
      cout<<year+nokori<<endl;
      return 0;
    }
  }
}