#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000001


int main() {
	
	string ans = "";
	int n;
	cin>>n;
	
	rep(i,n){
		int t = i+1;
		rep(j,100){
			if((t>>j)&1){
				ans += '1' + j;
				break;
			}
		}
	}
	
	rep(i,n){
		for(int j=i+1;j<n;j++){
			if(ans[i]==ans[j]){
				int x = i+1;
				int y = j+1;
				if(x+y>n)continue;
				if(ans[x+y-1]<=ans[i]){
				//	cout<<x<<','<<y<<endl;
					cout<<"No"<<endl;
					return 0;
				}
			}
		}
	}
	
	cout<<ans<<endl;
	
    return 0;
}