#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> P;
typedef vector<P> VP;
typedef vector<ll> VI;
typedef vector<VI> VVI;
#define REP(i, n) for (ll i = 0; i < (n); i++)
#define ALL(v) v.begin(), v.end()
#define OUT(n) cout << n << "\n"
// constexpr ll MOD=998244353;
// constexpr ll MOD=1000000007;
// constexpr ll INF=2e18;

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);

    ll A, B, X;
    cin >> A >> B >> X;

    ll ans = (X - 1) / A + 1;
    ans *= B;

    OUT(ans);
}