tj

#include<bits/stdc++.h>
using namespace std;
int n,a[2000005];
int main(){
    cin>>n;
    for(int i=1;i<=n;i++){
        if(i<5) a[i]=i;
        else if(i<11) a[i]=min(a[i-1]+1,a[i-5]+1);
        else a[i]=min(a[i-1]+1,min(a[i-5]+1,a[i-11]+1));
    }
    cout<<a[n];
}