#include <iostream>
using namespace std;
int main(){
    int n;cin>>n;
    int a = 0;
    for(int i = 0; n >= 5*i; i++){
        for(int j = 0; n >= 5*i+3*j; j++){
            if((n-(5*i+3*j))%2 == 0)a++;
        }
    }
    cout << a << endl;
}