#include <bits/stdc++.h> #include <iostream> #include <string> using namespace std; int main() { int n; cin>>n; string ans=""; if(n%2==0){ for (int i = 0; i < n/2; ++i) { ans=ans+"1"; } cout<<ans<<endl; return 0; }else{ ans="7"; for (int j = 0; j < n/2-1; ++j) { ans=ans+"1"; } cout<<ans<<endl; return 0; } } /* 2 1 3 7 4 11 5 71 6 111 7 711 8 1111 9 71111 10 11111 */