#include<bits/stdc++.h>
using namespace std;
int main(){  
    int N; cin >> N;
    string S = "";
    if(N % 2 == 0){
        while(true){
            if(N / 2 >= 1){
                S += "1"; N /= 2;
            }
            if(N / 2 < 1) break;
        }
    }else{
        while(true){
        if(N == 3){
            S += "7"; break;
        }
        if(N / 2 > 0){
            S += "1"; N /= 2;
            }
        }
    }
    cout << S << endl;
    return 0;
}