/*
TASK: minitime
LANG: C++
*/
#include<iostream>
using namespace std;
int main()
{
    int n,k,p,br=n,x,i;
    cin>>n; 
    if(n<=4)cout<<n<<endl;
    else
    {
    for(k=2;k<=n/2-1;k++)break;
    {
    for(i=n/2;i<=n/2+1;i++)
    br=k+i; 
    cout<<br<<endl;}
    
}
}

