#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for(int(i) = 0; (i) < (n); (i)++)
#define FOR(i, m, n) for(int(i) = (m); (i) < (n); (i)++)
#define All(v) (v).begin(), (v).end()
#define pb push_back
#define MP(a, b) make_pair((a), (b))
template <class T> vector<T> make_vec(size_t a, T val) {
    return vector<T>(a, val);
}
template <class... Ts> auto make_vec(size_t a, Ts... ts) {
    return vector<decltype(make_vec(ts...))>(a, make_vec(ts...));
}
using ll = long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
using Graph = vector<vector<int>>;
template <typename T> struct edge {
    int to;
    T cost;
    edge(int t, T c) : to(t), cost(c) {}
};
template <typename T> using WGraph = vector<vector<edge<T>>>;
const int INF = 1 << 30;
const ll LINF = 1LL << 60;
const int MOD = 1e9 + 7;

int main() {
    int x;
    cin >> x;
    if(x < 0) {
        cout << 0 << endl;
    } else {
        cout << x << endl;
    }
}
#include<bits/stdc++.h>
using namespace std;
typedef long long int ll;
int main()
{
      ios_base::sync_with_stdio(0);
      cin.tie(0);
      cout.tie(0);
      string a;
  cin>>a;
  ll n=a.size();
  ll i;
  bool ok=true;
  for(i=0;i<n;i++)
  {
    if((i+1)%2!=0 && int(a[i])<=90 && int(a[i])>=65)
      ok=false;
	else if((i+1)%2==0 && int(a[i])<=120 && int(a[i])>=97)
      ok=false;
  }
  if(ok)
    cout<<"Yes";
  else
    cout<<"No";
    return 0;
}
