// This file is a "Hello, world!" in C++ language by GCC for wandbox.
#include <iostream>
#include <cstdlib>
using namespace std;
int main(){
  int N,T = 5,G = 2,PG = 3;
  cin >> N;
    int num =0;
    for(int i=0; i < N; ++i){
        for(int j=0; j <= i; ++j){
            for(int k=0;k < N;++k){
                if((i*T) + (j*G) + (k*PG) == N ){
                    ++num;     
                }
            }
        }
    }
    cout << num << endl;
}