#include<stdio.h>

int main(void){
  int N, i, j, result = 0;
  scanf("%d", &N);

  for (i = 0; i <= N; i += 5){
    for (j = 0; j <= i; j += 2){
      if ((N-i-j) % 3 == 0) result++;
    }
  }
  
  printf("%d", result);
  return 0;
}