#include <algorithm> #include <climits> #include <cmath> #include <cstdio> #include <cstdlib> #include <ctime> #include <iostream> #include <sstream> #include <functional> #include <map> #include <string> #include <cstring> #include <vector> #include <queue> #include <stack> #include <deque> #include <set> #include <list> #include <numeric> using namespace std; const double PI = 3.14159265358979323846; const double EPS = 1e-12; const int INF = 1<<25; typedef pair<int,int> P; typedef long long ll; typedef unsigned long long ull; int main(){ int a; cin>>a; a += 50; a &= ~1; cout<<a<<endl; return 0; }