#include<bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int,int>pint;
typedef vector<int>vint;
typedef vector<pint>vpint;
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define all(v) (v).begin(),(v).end()
#define rep(i,n) for(int i=0;i<(n);i++)
#define reps(i,f,n) for(int i=(f);i<(n);i++)
#define each(it,v) for(__typeof((v).begin()) it=(v).begin();it!=(v).end();it++)
template<class T,class U>void chmin(T &t,U f){if(t>f)t=f;}
template<class T,class U>void chmax(T &t,U f){if(t<f)t=f;}

bool is_uruu(int y){return y%400==0||(y%4==0&&y%100!=0);}
signed main(){
    int x=0,d=0;
    for(int i=2015;i<2015+2800;i++){
        d=(d+365+is_uruu(i))%7;
        if(d==0)x++;
    }

    int N;cin>>N;
    int tmp=N-2014;
    int ans=tmp/2800*x;
    tmp=tmp%2800;
    for(int i=0;i<tmp;i++){
        d=(d+365+is_uruu(i+2015))%7;
        if(d==0)ans++;
    }
    cout<<ans<<endl;
    return 0;
}