#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
using ull = unsigned long long;
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; }
const vector<int> dx = {0,0,1,-1};
const vector<int> dy = {1,-1,0,0};
const ll INF = 1e18;
const ll MOD = 998244353;

int main(){
    int a,b,x;
    cin >> a >> b >> x;

    cout << (x+a-1)/a * b << endl;
}