#include<bits/stdc++.h>
using namespace std;
int main() {
	int q,z;
	cin>>q;
	if(q%10==0){
		z=q*0.8;
	}else{
		z=q;
	}
	cout<<z;
    return 0;
}

/**************************************************************
	Problem: 1870
	User: huangcanwu
	Language: C++
	Result: Accepted
	Time:21 ms
	Memory:2072 kb
****************************************************************/