#include<iostream>
#include<string>

using namespace std;

int main(){
 int n,count=0;
 cin >> n;

 for(int i = 0; i < n/5+1; i++){
        for(int j = 0; j < i+1;j++){
            for(int k = 0; n/3+1;k++){
              if(i*5+j*2+k*3==n)
                count++;}}
  }
 cout << count << endl;
return 0;
}