#include <iostream>
#include <cstdlib>

int main()
{
    int num;
    std::cin >> num;
    
    if (num % 2 != 0)
        std::cout << "7";
    else
        std::cout << "1";
    
    num = num/2 - 1;
    
    while(num > 0) {
        std::cout << "1";
        num -= 1;
    }
}