#include<bits/stdc++.h>
using namespace std;
double f,g,h[9999],a,b,c,d,e[9999];
char k,l,m[9999];
string n,p,q[9999];
int main()
{
    cin>>a>>b>>c;
    f=(a/b)*c;
    cout<<fixed<<setprecision(6)<<f;
    return 0;
}