C++ :

#include<iostream>
using namespace std;
int main(){
	int n;
	float a=10.0;
	cin>>n;
	for(int i=1;i<=n;i++){
		a/=2;
	}
	cout<<a;
	return 0;
}

Python :

# coding=utf-8
n = int (input())
h = 10 / 2 ** n
print (h)