#include <iostream>
using namespace std;
bool uru(int n){
  if(n%400 == 0)return true;
  else if(n%100 == 0)return false;
  else if(n%4 == 0)return true;
  return false;
}
int main(){
  long long n;cin>>n;
  int nw = 0;
  long long ans = 0;
  for(int i = 2015; min(2015+2800LL,n+1) > i; i++){
    if(uru(i))nw += 2;
    else nw += 1;
    nw %= 7;
    if(!nw)ans++;
  }
  if(2014+2800 < n){
    long long x = (n-2014)/2800;
    ans = ans*x;
    nw = 0;
    for(int i = 0; (n-2014)%2800 > i; i++){
      if(uru(2015+i))nw+=2;
      else nw += 1;
      nw %= 7;
      if(!nw)ans++;
    }
    cout << ans << endl;
  }else{
    cout << ans << endl;
  }
}