#include <bits/stdc++.h>

using ll = long long;
using ull = unsigned long long;
using ld = long double;
#define rep(i,a,b) for (int i = a; i < b; i++)
#define irep(i,a,b) for (int i = a; i > b; i--)
#define print(n) cout << n << endl
#define rup(a,b) (a+b-1)/b

using namespace std;

int main(){
    cout << fixed << setprecision(15);
    
    int N;
    cin >> N;
    if (N%2 == 1){
        cout << 7;
        N -= 3;
    }
    rep(i,0,N/2) cout<<1;
    cout<<endl;
    
    //system("pause");
    return 0;
}