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

#include<bits/stdc++.h> using namespace std; int main(){ int x,pz; cin>>x; pz=x; while(x>=5){ pz+=(x/5)*2; x-=(x/5)*3; } cout<<pz; return 0; }

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