#undef __STRICT_ANSI__
#include <iostream>
#include <fstream>
#include <vector>
#include <algorithm>
#include <cstring>
#include <set>
#include <cstdlib>
#include <queue>
#include <unordered_map>
#include <iomanip>

#define maxn 18
#define inf 1000000000

using namespace std;

ifstream fin("immediate.in");
ofstream fout("immediate.out");

struct
{
    int val;
    int conf, i;
}dp[1<<maxn][maxn], dp2[1<<maxn][maxn];
int n,m;
vector<pair<int,int> > G[maxn];
bool viz[18];

void recon (int conf, int i, int cnt)
{
    if (dp[conf][i].conf != -1)
        recon (dp[conf][i].conf, dp[conf][i].i, cnt + 1);
    else
    {
        fout << cnt << " ";
    }
    fout << i+1 << " ";
}

int main()
{
    double x = 2.5;
    cout << fixed << setprecision(1) << x;
}