#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i,n) for(int i=0;i<n;i++)
signed main(){
  ll a,b,k;
  cin>>a>>b>>k;
  if(a==1||b==1){
    cout<<k<<endl;
    return 0;
  }
  ll x=lcm(a,b);
  vector<ll>vec;
  for(int i=1;i<=x;i++){
    if(i%a==0||i%b==0){
      vec.push_back(i);
    }
  }
  ll s=vec.size();
  if(s>=k){
    cout<<vec[k-1]<<endl;
    return 0;
  }  
  cout<<(k/s)*x+vec[k%s-1]<<endl;
  return 0;
}