#include<bits/stdc++.h>
using namespace std;
int n;
int main(){
	cin>>n;
	int r=n/5;
	if(n%5>=3){
		r++;
	}
	cout<<r*5;
	return 0;
}

#include<bits/stdc++.h>
using namespace std;
int n,m;
int main(){
	cin>>n>>m;
	if(n>=10||m>=20){
		cout<<1;
	}else{
		cout<<0;
	}
	
	
	
	
	return 0;
}

#include<bits/stdc++.h> using namespace std; int main() { int a,j; cin>>a; int b=a%5; if(b1) j=a-1; if(b2) j=a-2; if(b0) j=a-0; if(b3) j=a+2; if(b==4) j=a+1; cout<<j; return 0; }

#include<bits/stdc++.h>
using namespace std;
int n,m;
int main(){
	cin>>n>>m;
	if(n>=10||m>=20){
		cout<<1;
	}else{
		cout<<0;
	}
	
	
	
	
	return 0;
}

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int a,j;
	cin>>a;
	int b=a%5;
	if(b==1)
	j=a-1;
	if(b==2)
	j=a-2;
	if(b==0)
	j=a-0;
	if(b==3)
	j=a+2;
	if(b==4)
	j=a+1;
	cout<<j;
    return 0;
}