#include <iostream>
#include <bits/stdc++.h>
using namespace std;
string decimal_to_binary (int n,int m) {
string res = "";
while (n > 0) {
int digit = n % 2;
res += digit + '0';
n /= 2;
}
while (res.size() < m) {
res+="0";
}
reverse(res.begin(), res.end());
return res;
}
int main()
{
int m;
cin>>m;
for (int i = 0; i<(1<<m); i++) {
for (int j = 0; j<m; j++) {
if ( (i& (1<<j)) > 0) {
cout<<7;
} else {
cout<<4;
}
}
cout<< endl;
}
return 0;
}
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