#include <iostream>
#include <stdio.h>
using namespace std;
typedef long long INT;

INT gcd(INT a, INT b)
{
    if (b == 0) return a;
    return gcd(b, a % b);
}

int main()
{
    INT N, G, V, GCD;
    cin >> N;
    cin >> G;
    cin >> V;

    G = N / 5 * G;
    GCD = gcd(G, V);
    G /= GCD;
    V /= GCD;

    INT n = G / V;
    cout << n << ".";
    n = G - (n * V);
    cout << n * 100000000000 / V << endl;
}