#include <bits/stdc++.h>
#define rep(i,n) for (int i=0; i<(n); ++i)
using namespace std;
using ll=long long;
int main(){
    double a,b,c;
    cin>>a>>b>>c;
    if(a<=c){
        cout<<fixed<<setprecision(10)<<a*(c/b)<<endl;
    }
    else{
        cout<<fixed<<setprecision(10)<<a/b*c<<endl;
    }
}