#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define int long long
const int N=1e6+10,M=1e9+7;
stack<int>st;
ll n,a,b,c,pre[N],mi=1e18,ma=0,k,d=0,q,m,ans=0,x;
vector<ll>vec;
map<ll,ll>dem;
string s;
signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    cin>>a>>b>>x;
    if(x<=a)
        cout<<b;
    else
    if(x%a==0)
        cout<<(x/a)*b;
    else
    if(x%a!=0)
        cout<<(x/a)*b+b;
}