#include <cstdio>
using namespace std;
int main(){
    int n,x,y;
    scanf("%d",&n);
    x=n/10,y=n%10;
    printf("%.1f\n",1.0*x/y);
    return 0;
}

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int a;
    double v,c,b;
    cin >> a;
    b = a/10;
    c = a%10;
    v = b / c;
    printf("%.1f",v);
    return 0;
}

//so eazy!!!!!👍

#include <bits/stdc++.h>
using namespace std;
int main(){
    cout << 0.1;
    return 0;
}

kao，第一次提交的时候忘写；了

过辣！（脑残人士的欢呼）

    long long n;
    cin>>n;
    cout<<fixed<<setprecision(1)<<1.0*(n/10)/(n%10);

#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
	int n,g,s;
	cin>>n;
	cout << fixed << setprecision(1) << (n / 10) * 1.0 / (n % 10);
    return 0;
}

#include <iostream>//hetao3097453
#include <iomanip>
using namespace std;
int main()
{
    int n;
    cin >> n;
    double ans1 = n % 10;
    double ans2 = n / 10;
    double ans = ans2 / ans1;
    cout << fixed << setprecision(1) << ans;
    return 0;
}

#include <bits/stdc++.h>
using namespace std;
int main()
{
    cout<<0.1;
    return 0;
}