#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,g,s;
	double ans;
	cin>>n;
	s=n/10%10;
	g=n%10;
	ans=s*1.0/g;
	printf("%.1f",ans);
	
}



/**************************************************************
	Problem: 1607
	User: zhuangsongyu
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/