C++ :

#include<bits/stdc++.h>
using namespace std;
int n;
int main()
{
	cin>>n;
	if(n<=60) cout<<3;
	else{
		n-=60;
		int t=n/60;
		if(n%60!=0) t++;
		cout<<3+t*5;
	} 
	
    return 0;
}