#include<bits/stdc++.h>
#define REP(i,n) for(int i=0,i##_len=(n);i<i##_len;++i)
#define rep(i,a,b) for(int i=int(a);i<int(b);++i)
using namespace std;
using ll = long long;

int main(){
    int A,B,C;cin>>A>>B>>C;
    printf("%.16f\n",double(A*C)/double(B));
}