#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define all(v) begin(v), end(v)
#define FOR(i,a,b) for(int i=(a);i<(int)(b);i++)
#define rep(i,b) FOR(i,0,b)

const ll mod = 1e9+7;

ll INF = 100000000;

ll n,k,a[100010],b[100010],ans;
string s;
int main(){
  cin>>n;
  cout<<n/1000000001<<endl;

  return 0;
}