#include<bits/stdc++.h>
using namespace std;
	
	int yu(long long a){
		
		   for(int i=0;i<=a;++i){
		   	cout<<a;
		   	return a+2;
		   	sery:a=a+3;
		   	goto sery;
		   	
		   }
	}
	int main(){
		int s;
		cin>>s;
		cout<<yu(s);
		return 0;
}