#include<bits/stdc++.h>
#define ll long long
#define db double
#define taskname ""
#define pb push_back
#define fi first
#define mll map<ll,ll>
#define se second
#define in insert
using namespace std;
const int N=1e6+1;
const int M=1e3+1;
//ll a[101];
const long long MOD=1e12+39;
//ll a[M][M]={},b[M][M]={};
//ll a[N]={},b[N]={};
//ll n,d,kq,res;
//map<ll,ll> mp;vector<ll> v;set<ll> se;
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    ll a,b,x;
    cin>>a>>b>>x;
    ll k=x/a;
    if(x%a!=0) k++;
    if(k==0) k++;
    cout<<k*b;
}