#include <bits/stdc++.h>
using namespace std;
#define rep(i,a,b) for(LL i = a;i<b; i++)
#define rrep(i,a,b) for(LL i = a;i>b; i--)
#define tobirep(i,a,b,c) for(LL i = a;i<b; i+=c)
#define tobirrep(i,a,b,c) for(LL i = a;i>b; i-=c)
#define INF ((1LL<<62)-(1LL<<31))
#define ooki 9,223,372,036,854,775,807
#define tii -9,223,372,036,854,775,808
typedef long long LL;
int main(){
 LL n,count=0;
  cin >> n;
  rep(t,0,n/5+1){
    rep(j,0,n/3+1){
      rep(i,0,t+1){
        if(5*t+j*3+i*2==n){count++;}
      }
    }
  }
  cout << count << endl;
  
}