//ethan_h
#include<bits/stdc++.h>
using namespace std;
#define ll long long
/*void test(){
ll n,t;cin>>n>>t;
ll s=0;
//string s;cin>>s;
vector<ll>a(n);
for(ll i=0;i<n;i++){
cin>>a[i];
s+=a[i];}
if(s/t){
        int p;
p=s/t;
t-=(p*t);
for(ll i=0;i<n;i++){
    if(t>=a[i]){
        p++;
        t-=a[i];
    }
}
cout<<p<<endl;

}
else{
        int p=0;
    for(ll i=0;i<n;i++){
        if(t>=a[i]){
                p++;
         t-=a[i];

        }

    }
    cout<<p<<endl;
}
*/

int main(){
ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
ll n;cin>>n;
ll ans=0;
if(n<=3){
    cout<<n;
}
else{
    cout<<5*n-12;
}




return 0;}