#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;
int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);
	if(fopen(taskname".inp","r"))
	{
		freopen(taskname".inp","r",stdin);
		freopen(taskname".out","w",stdout);
	}
	ll a,b,x;
	cin>>a>>b>>x;
	if(x<a) cout<<b<<endl;
	else{
		if(x%a==0) cout<<b*x/a<<endl;
		else cout<<b*(x/a+1)<<endl;
	}
	return(0^0);
}