#include <bits/stdc++.h>
#define PI 3.14159265359
using namespace std;
const int64_t mod = 1e9 + 7;

int main() {
	int N;
	cin >> N;

	vector<int> v(N);
	for (int i = 0; i < N; i++) {
		if (!i) v.at(i) = 1;
		else v.at(i) = 3;
	}

	for (int i = 0; i < N; i++) {
		cout << v.at(i);
	}

	cout << endl;
}