#include<bits/stdc++.h>
#define ll long long

using namespace std;

int main()
{

    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);

    int a,b,x; cin>>a>>b>>x;
    
    if(x<a) cout<<b;
    else cout<<x/a*b+min(1,x-(x/a)*a)*b;
    
    cout<<endl;

    return 0;
}