#include <iostream>
#include <iomanip>
using namespace std;

template <typename T>
T gcd(T a,T b){
  if(a%b==0)return b;
  else return gcd(b,a%b);
}

int main(){
  cout << fixed << setprecision(20);
  int a,b,c;cin>>a>>b>>c;
  int d = a*b/gcd(a,b);
  int hol = d/b*c;
  cout << (double)hol/(d/a) << endl;

}