#include <bits/stdc++.h>
using ll=long long;
#define rep(i,s,n) for (ll i = (s); i < (n); i++)
using namespace std;
using Graph = vector<vector<ll>>;
ll MOD=1e9+7;
const ll INF=1e18;


int main(){
  ll A,B,X;
  cin>>A>>B>>X;
  cout<<((X+A-1)/A) * B<<endl; 
}